Vietnamese Football After the 2026 AFF Cup: V.League, Naturalization and the Question of Tactical Depth

On January 5, 2026, at Rajamangala Stadium in Bangkok, I sat in a small room in Nagoya, rewinding the tape of the second leg of the 2026 AFF Cup final four more times before turning off the machine. On screen, Nguyen Xuan Son - the naturalized striker who had just become a phenomenon of Vietnamese football - lay collapsed on the grass, his left leg bent at an angle nobody wanted to look at. The medical staff ran in. The stands behind the goal fell silent for a few seconds, then the shouts of the small group of Vietnamese fans on the terraces grew more intense, as if they themselves understood that their team was about to have to play with a different attack. Vietnam still won 3-2, still lifted the trophy, still returned to Hanoi amid a sea of people. But in the moment the stretcher rolled across the touchline, something did not fit between the emotion of the crowd and the nature of the match.

That is why I am writing this. Not to diminish a real championship, but to ask: if you take the trophy out of the picture, what does Vietnamese football actually have left in its hands?

Context: Why Vietnamese people believe in a new cycle

To understand why the 2026 AFF Cup was received as a landmark, it must be placed in the proper flow of Vietnamese football history. Before 2026, the national team lived under the shadow of the Tiger Cup and a string of runner-up finishes. The 2026 AFF Cup title - with Le Cong Vinh's goal in the second leg of the final against Thailand - opened a new psychological era: Vietnamese people began to believe they could win at the regional level. Ten years later, in 2026, under coach Park Hang-seo, Vietnam won the AFF Cup for the second time, while also creating an unprecedented wave of confidence after the U23 Asian Cup runner-up run in Changzhou and the 2026 Asian Cup quarterfinals.

The period between those two milestones, and especially the 2026-2026 era, shaped a kind of "identity" that Vietnamese media often described with very quick phrases: warrior spirit, disciplined defensive block, goals from set pieces, and an almost religious belief in endurance. Park Hang-seo successfully built a team that knew itself and its opponent, played defensive counter-attacking football, maximized set pieces, and turned technical modesty into a collective weapon.

But there is a paradox that very few are willing to look at directly: throughout that golden era, Vietnam never once imposed its game on an opponent of equal standing. The team won by waiting, by enduring, by scoring from a corner in the 89th minute. That was a reasonable model given Vietnam's human resources, but it also raised a structural question: what happens when regional opponents learn to counter it?

The Philippe Troussier period, from 2026 to early 2026, was an attempt to answer that question - and a painful failure. The French coach tried to shift Vietnam toward possession football and proactive pressing, but the national team did not have enough individual quality to execute it. The result was defeats to Indonesia in the 2026 World Cup qualifiers, including a home loss, that pushed Troussier out of the job. His departure left a bitter lesson: you cannot impose an elite football philosophy on a collective that has not been trained to live with it.

When Kim Sang-sik, the South Korean coach, took over the Vietnamese national team in mid-2026, he inherited a team confused about its identity. Kim Sang-sik did not come to stage a philosophy revolution. He came to do what any pragmatic coach does: stabilize the structure, bring the team back to what it does best, and look for a new spearhead. The 2026 AFF Cup was the result of that pragmatism. And within that pragmatism, one name almost reshaped the entire game.

Core Part 1: The team's tactical structure under Kim Sang-sik

Let us start with what is observable on tape, not with what is written in newspapers.

Under Kim Sang-sik, Vietnam at the 2026 AFF Cup played mainly in a hybrid structure between a 3-4-3 and a 4-4-2 in defense, shifting to a 4-3-3 in attack. The most notable point is not the system, but how the team divided responsibility. Kim Sang-sik retained a three-center-back block in big matches, but changed how the wide midfielders operated: instead of running the flanks purely to cross, they drifted inside to form a four-man midfield block capable of short circulation.

This was an important change. In the Park Hang-seo era, Vietnam often pushed its two wide midfielders to the touchline and waited for long balls. Under Kim Sang-sik, there was an effort - though imperfect - to build the ability to pass in midfield. Nguyen Hoang Duc became the main pivot, receiving between the opponent's lines and distributing. Do Hung Dung, when he had the legs, played the anchor role. The combination of a technical playmaker and an experienced defensive midfielder is a basic formula, but it needs surrounding players who know how to move off the ball - and that is precisely Vietnam's weakness.

Looking at how Vietnam scored at the 2026 AFF Cup, a clear pattern emerges: most goals came from two sources. First, set pieces - corners, free kicks, long throw-ins. Second, quick transitions, in which the ball was played forward to Nguyen Xuan Son or Nguyen Tien Linh at the moment the opponent had not yet reorganized. Very few goals came from controlled short passing combinations, from sustained one-twos in the final third.

That is not a criticism. Elite football does not reward beauty; it rewards efficiency. But it is an important tactical fact, because it shows that Vietnam has still not solved the problem Troussier tried and failed to solve: how to attack an opponent that has dropped deep and organized its defense.

When opponents sit low, Vietnam struggles to create chances. The ball is often circulated slowly between the center-backs, with few diagonal runs, few line-breaking passes. The dependence on individuals - especially Nguyen Xuan Son - becomes obvious. With Son on the pitch, Vietnam has an anchor point who can hold the ball, link play, and stretch the defensive line. When Son leaves the pitch, the team loses its attacking axis and is forced back to old methods: long balls and set pieces.

This is something I noted in my notebook long ago, and it is nothing new: Vietnamese football has a structural paradox. The country's development base produces many technically gifted players, skillful in tight spaces, but lacks players capable of deciding games in the final third in the context of modern football. That is why the arrival of a naturalized striker like Nguyen Xuan Son had such an outsized impact - and also why the naturalization story needs serious analysis rather than being pushed to two extremes: blind praise or total rejection.

Core Part 2: V.League - foundation or burden?

It is impossible to analyze the Vietnamese national team while ignoring V.League 1, because this is where most of the national team's manpower comes from. And this is also where the picture becomes most complex.

V.League 1 in the 2010s and the first half of the 2020s was a league with significant spectator appeal in some localities, but it was trapped in an unsustainable financial spiral. The common model was dependence on a few wealthy businesses or individuals who sponsored clubs as personal projects or media tools, rather than as independent business entities. When the sponsor withdrew, the club collapsed.

We have seen this many times. Saigon FC, once a force in the V.League, had to dissolve for lack of funding. Than Quang Ninh, a club with tradition and a significant fan base in the north, met a similar fate. Other clubs lived with prolonged wage arrears, with cases reported in the media of players unpaid for months. These are not isolated incidents; they are a systemic pattern.

This financial instability has direct consequences for the national team's quality. A player competing in the V.League while anxious about whether he will be paid at the end of the month will struggle to focus fully on developing himself. A club without a stable budget cannot invest in youth development, in sports medicine, in data analysis, or in high-quality overseas training camps. Those investments are the foundation of every developed football nation, and they require stability over years, even decades.

There is one small detail I consider symbolic, and I recorded it after a trip to Vietnam: the facilities of some V.League clubs, compared with what I have seen at second-division J.League clubs, show that the gap is not in immediate money, but in continuity. A J.League club may not be richer than a V.League club, but it has a five-year and ten-year plan, a standardized youth system, and a data team. A V.League club often lives season by season, decision by decision of its owner.

V.League also has problems with competitiveness and commercial appeal. The league lacks the stable participation of many big clubs, matches do not always draw fans to the stadium, and television rights value is low relative to the potential of a country of nearly 100 million football-loving people. This forms a vicious circle: less money leads to lower quality, lower quality leads to fewer fans, fewer fans leads to less money.

The rare bright spots lie with a few well-run clubs. Hoang Anh Gia Lai, in the golden era of the generation trained at the JMG academy, once created a wave of hope about youth development. But even there, the story shows the limits of the model: that talented generation, with Nguyen Cong Phuong, Luong Xuan Truong, Nguyen Tuan Anh, and Nguyen Van Toan, did not achieve what the media expected, partly because of the enormous pressure placed on them from too young an age, and partly because the surrounding environment was not professional enough to lift them higher.

Core Part 3: Naturalization and the Nguyen Xuan Son story

This is the most sensitive part of the article, and also the part that needs to be analyzed with facts rather than emotion.

Nguyen Xuan Son, born in Brazil as Rafaelson Bezerra Fernandes, came to Vietnam to play for V.League clubs, impressed with his scoring, and was naturalized in 2026. He quickly became the center of Vietnam's attack, scored consistently at the 2026 AFF Cup, and won the tournament's top scorer award. The serious injury in the second leg of the final was a blow not only personally but structurally for the national team.

The question Vietnamese football needs to face is not "is naturalization good or not" - that is a question wrong in its very nature. In modern football, naturalization is a legal and common tool. France, Germany, Portugal, Japan, and many other countries have used it. Indonesia, Vietnam's direct regional rival, has pushed an aggressive naturalization program with a wave of players of Indonesian descent born in Europe, and reaped results by advancing deep in the 2026 World Cup qualifiers.

The right question is: what problem in Vietnam's striker development system is naturalization hiding?

Vietnamese football has produced many quality midfielders and defenders, but very few strikers of international caliber. Nguyen Tien Linh is a good striker at regional level, but he lacks the speed and the ability to create breakthroughs against high-quality defenses. Nguyen Cong Phuong, a talent who was greatly expected, never achieved the necessary consistency. Other attacking players are often trained to play wide or as a second striker, not as a true number 9.

The striker shortage is a structural problem traceable to a development philosophy. Vietnamese football, for many years, trained players toward technical, skillful, safe qualities suited to a defensive counter-attacking game. But the striker position requires a different skill set: positioning inside the box, holding the ball under pressure, finishing in tight spaces, and above all a stubborn self-confidence in front of goal. These qualities are not sufficiently cultivated in Vietnam's youth system, where winning youth tournaments is often prioritized over developing individual players.

When Nguyen Xuan Son arrived, he filled a gap the system could not fill itself. But a gap filled by one individual is not a gap solved. It is only a gap postponed. Son's injury in the final was a cruel reminder of the fragility of that solution. If Son does not return to his old form, Vietnam will again face the question it has avoided: who will score?

There is one thing I want to make clear, because it is often misunderstood. Pointing out the dependence on a naturalized player is not a denial of that player's value. Nguyen Xuan Son is a good player, and he deserves what he has achieved. The problem is not him; the problem is the system that allowed that gap to exist for so long. When a person is cast into a statue, they begin to lose themselves on the pitch - and that is true both of what people expect of them and of what people blame them for when they are absent.

The contrarian angle: What the trophy hides

Now comes the part I consider most important, and also the part that will annoy some people.

The general consensus in Vietnam after the 2026 AFF Cup is: the national team is back, Kim Sang-sik has succeeded, and Vietnamese football is entering a promising new cycle. I believe this consensus is right emotionally but wrong analytically.

Look at the nature of the tournament. The AFF Cup is a regional arena where the level between teams is not very different, and where physicality, mentality, and luck play a bigger role than in continental or world competitions. Vietnam winning the AFF Cup does not mean Vietnam has closed the gap with Japan, South Korea, or even with Asia's top teams. It only means Vietnam is the best team in an arena where Vietnam was already in the leading group.

What is more concerning lies in how the team won. Vietnam won mainly through character, through set pieces, through a naturalized striker at the peak of his form, and through the ability to endure in difficult moments. These are admirable qualities, but they are not the foundation for a leap in quality. A team that wants to go further at continental level needs a style that can control matches, needs organized attacking against tightly defending opponents, needs a midfield that can impose tempo. Those are things Vietnam still lacks.

There is a comparison I find useful. Japan, in the 1990s, built a football nation from almost absolute zero. They did not win a regional tournament and then become complacent; they set the goal of winning the World Cup and built a system - J.League, academies, football schools - to pursue that goal over decades. That strategic patience is something Southeast Asian football in general, and Vietnam in particular, often lacks. In Vietnam, success is often measured by short-term trophies, and that creates pressure that makes long-term decisions difficult.

Another paradox needs to be named: the development of Vietnamese football is being blocked by its own success at the regional level. When the national team wins, pressure to change decreases. When the national team wins, fans are satisfied, and the hard questions about the development system, about V.League's sustainability, about coaching quality, are pushed aside. Trophies can be a collective sedative.

I am not saying Vietnam should refuse trophies. They are real achievements, and they bring joy to millions. But I am saying: do not let that joy obscure the structural problems. A trophy is a moment; a football nation is a process. And Vietnamese football, at this moment, has more beautiful moments than a solid process.

What is actually changing

To be fair, there are positive signals I do not want to ignore.

First, introducing VAR into the V.League is an important step. It not only improves the fairness of decisions, but also forces referees and clubs to professionalize. I once spent a lot of time studying how teams use VAR waiting periods as a tactical tool, and I believe this is an aspect Vietnamese football will soon have to face: how to manage the dead moments of a match.

Second, the new generation of players has more opportunities to be exposed to international football. Some young Vietnamese players have been sent abroad, though most have not succeeded. Nguyen Quang Hai played for Pau FC in France; Nguyen Van Hau went to Heerenveen in the Netherlands; some others have tried their luck in Japan or South Korea. These experiences, even when unsuccessful professionally, still bring valuable lessons about how elite football operates.

Third, awareness of sports science and data analysis is rising. Clubs are starting to hire analysts, to care about managing training load, to look at data instead of relying only on a coach's intuition. This is a slow but important cultural shift.

However, these signals are still small relative to the scale of the problem. Vietnamese football is improving at the edges, while the problems at the center - the development system, the financial sustainability of clubs, coaching quality, and above all a clear tactical philosophy - remain unsolved.

Looking ahead: Three scenarios

From the perspective of someone who has followed Asian football for many years, I see three possible scenarios for Vietnamese football in the period ahead.

The first, and most optimistic, is that Vietnam successfully uses the 2026 AFF Cup as a springboard to invest seriously in the system. This requires visionary leadership at federation and club level, patience with short-term results, and a long-term commitment to youth development. In this scenario, Vietnam could become a genuine force at Asian level within a decade.

The second, and perhaps the most likely, is that Vietnam continues to maintain its leading position in Southeast Asia, wins another regional title or two, but cannot cross the threshold to compete with Asia's top teams. This is a stable but mediocre scenario, a continuous postponement of hard questions.

The third, and most concerning, is that Vietnamese football is overtaken right within the region. Indonesia, with a large-scale naturalization program and investments in football, is showing clear ambition. Thailand, though going through a transition, remains a football nation with depth. If Vietnam stalls while rivals advance, its regional leadership could erode quickly.

I do not have enough data to say which scenario will happen. But I have enough experience to say that which scenario happens will depend on decisions made in the next few years, not on a trophy won in the past.

Conclusion: An unanswered question

Magic does not exist; there are only those who read the rules carefully before others blink. In football, those "rules" are structure: how a country develops players, how its clubs are run, how it treats success and failure. Countries that understand this often go far. Countries swept up by moments of glory often stand still.

Vietnamese football, at this moment, stands at a fork. One path is to continue living with regional trophies, with nights of celebration, with brief waves of pride. The other is a far harder path: building a system that can nurture talent from childhood, creating financially stable clubs, and developing a tactical philosophy that can stand against the strongest opponents.

The 2026 AFF Cup trophy is a real achievement. But it does not answer the biggest question: when Nguyen Xuan Son is no longer there, when set pieces stop finding the net, when opponents drop deep and wait, what will Vietnamese football do? That is the question the championship left behind, and it will echo until someone answers it with a team, not a trophy.

The most important person in a match does not run on the pitch; they sit quietly in the stands where no one sees them. In the case of Vietnamese football, that person is not a coach, nor a naturalized striker. That person is the long-term strategist - and so far, that person has not appeared.