The 2026 AFF Cup Title: Kim Sang-sik, Nguyen Xuan Son, and the Real Limits of Vietnamese Football

On the night of January 5, 2026, at Rajamangala Stadium in Bangkok, I sat in front of a screen in my small apartment in Incheon, the clock reading almost 3 a.m. In the 32nd minute of the second leg of the final, Nguyen Xuan Son went down, both hands clutching his right leg, and the singing of tens of thousands of Vietnamese fans in the stands abruptly died. I wrote exactly one line in my notebook: "Here it is, the real test." Not a test for one player. A test for an entire football nation that had just learned how to win, but not necessarily how to win without someone coming to save it.

Vietnam still won. The second leg finished 3-2, 5-3 on aggregate against Thailand, and the ASEAN trophy stayed in the hands of Kim Sang-sik's team for the third time in history. But the way they won, not the fact that they won, is what kept me up writing this before dawn.

I was born in Vietnam and I work as a football commentator in South Korea. That dual vantage point makes me watch this final with two eyes: one eye of a Vietnamese who wants the team to win, one eye of an outsider sitting at the market, counting every pass and asking what will remain when the emotion settles. And what remains, for me, is an uncomfortable question: is this football nation improving, or is it being propped up by imported hands?

Before getting to that uncomfortable part, let us rebuild the context properly. In March 2026, the Vietnam Football Federation terminated Philippe Troussier's contract after a poor run in World Cup 2026 qualifying, including a defeat to Indonesia. The hot seat went to Kim Sang-sik, a former Jeonbuk Hyundai Motors coach who had won K League 1 and tasted both the summit and the abyss of management. That choice was no accident. It was the next chapter of a book Vietnam opened in 2026 with Park Hang-seo: handing the fate of national football to a Korean.

I have followed Vietnamese football long enough to remember the day Park arrived, when nobody believed an assistant to Guus Hiddink could achieve anything. Then he took the team to a U-23 Asian Cup final, an Asian Cup semi-final, two AFF Cup titles and a SEA Games gold. When Park left, people said Vietnamese football had grown up. When Troussier arrived with beautiful possession football that was out of sync, people saw a machine with the wrong gears. And when Kim Sang-sik arrived, people returned to the old formula: discipline, quick transitions, and a striker who knows how to score.

That is when Nguyen Xuan Son entered the story. A Brazilian-born, naturalized forward carrying the hopes of an entire nation. I sat for a long time over his numbers in the domestic league, where he scored like a machine, and I asked myself whether a naturalized player could solve Vietnamese football's core problem or merely cover it up. The night in Bangkok answered half of it: Xuan Son scored, then Xuan Son broke his leg, and the team still had to stand up on its own.

The first thing that must be said plainly: Vietnam won the 2026 AFF Cup with football built on set pieces and quick transitions, not the possession football the V.League is trying to teach its players. This is the contradiction at the center of every debate about Vietnamese football, and it is not a small one.

Look at how Kim Sang-sik built the team. He did not try to turn Vietnam into a side that presses high continuously, as Park once did at his peak, nor did he force possession football as Troussier dreamed. He built a compact, mid-block defense that holds its lines, then used the flanks and set pieces as weapons. In the big matches of this tournament, Vietnam often did not hold more of the ball than their opponents, but they shifted from defense to attack within a few passes. That is the football of efficiency, not of beauty.

I have a habit of taking notes on every match I watch. For Vietnam's AFF Cup games, I counted how often the team touched the ball in the final third in a direct way: the ball going from the middle to the flank, then a cross, or a long ball for the striker to contest. There were very few multi-pass combinations before the penalty area. That is not bad. It only speaks to the truth about the player quality Kim Sang-sik had, and about how he chose to optimize it.

When Xuan Son was on the pitch, Vietnam had an anchor. He did not just score; he stretched opposing defenses, creating space for midfielders to run into. His goals in earlier matches were not elaborate individual moves. They were the result of a team that knew how to deliver the ball to where he stood. That is the mark of a system, not of a personal miracle.

But when he went down in the 32nd minute, the system lost its vertical axis. And what happened afterward is what deserves our conversation. Vietnam did not collapse. They dropped deeper, defended more tightly, and exploited exactly what they had: set pieces, chaotic moments, and stubbornness. A team that can change its structure when it loses its star is a well-coached team, but it is also a team that already knew the star was not everything.

This is where I want to linger, because it runs counter to most of the media reaction after the match. After the title, the story told was one of a team that had found its identity, of a Korean coach who understood Vietnamese football, of a golden generation of players. I do not deny any of that. But I want to look at the foundation the trophy is standing on, because the trophy is beautiful, while the foundation decides how long the building stands.

That foundation is the V.League. And this is where I become the difficult guest at the party. I follow the V.League from a distance, through recordings and viewing sessions with friends in Incheon. I do not sit in the stands, and I will not pretend to know the smell of the grass at Hang Day. But one thing I have noticed more clearly than anything else: V.League matches are often decided by fitness and chaotic moments rather than by complex tactical structures. Vietnamese players run a lot, they obey, they are disciplined. But they are rarely placed in situations that demand solving space under pressure at high speed, repeatedly, enough times for it to become instinct.

That is why, when we watch the national team play on the continental stage, we see a different face. At the AFF Cup, Vietnam is the strongest team in the region and can impose its game through individual quality. But when it steps into World Cup qualifying or the Asian Cup, where opponents give you no time or space, football built on fitness and quick transitions hits a ceiling. I do not need a specific number to know this. I have seen it too many times: a Vietnamese team that plays well for the first 60 minutes, then runs out of gas in the final 30, losing the match on plays that should have been handled with the head rather than the feet.

Vietnam's problem is not that it lacks talent. The problem is that its talent-production system creates players who are excellent for a regional tournament, but not enough for a continental one. And the AFF Cup, with all its excitement, quietly hides that gap.

This is where the Korean story becomes interesting in another way. I live in Incheon, and I know what Koreans think about their own football. They disdain the K League in a way outsiders cannot understand, because they compare it to Europe. But there is one thing Koreans do very well: they export what they know. Park Hang-seo went, Kim Sang-sik came, and now Vietnamese football is again run by a Korean brain. I wonder whether that is development or a form of dependency.

Do not misunderstand me. Kim Sang-sik did a good job. He arrived when the team was in a crisis of confidence, stabilized the dressing room, and made sensible personnel choices. He did not try to become a second Park Hang-seo, and that was smart. He accepted the player quality he had and built a system suited to it. That is the mark of a mature coach.

But there is a truth we often avoid: a good coach can raise the ceiling of a national team, but he cannot raise the ceiling of an entire football nation. That ceiling is set in academies, in youth training grounds, in the quality of the V.League, in the number of players developed to play in Europe. And there, Vietnam is still a long way off.

Let me tell a story from my own mistake. In 2026, at the Russia World Cup, I wrote a piece arguing that South Korea's win over Germany was an illusion. I was right on the data, but I ignored something I now see more clearly: historic moments are created not only by data, but by the belief they generate. I was wrong at the Russia World Cup, and it was the best thing that ever happened to me, because it taught me that a hot-take writer can be right about the numbers and still wrong about the people.

I bring that lesson into this piece. When I say the AFF Cup title hides structural problems, I am not saying it is meaningless. I am saying its joy is real, but it should not become evidence of a maturity Vietnamese football has not reached. A trophy cannot build an academy. A win over Thailand cannot produce a midfielder who can play under pressure in the AFC Champions League.

And this is where I must argue against myself, because I know I am standing in a vulnerable position. There are three reasons I might be wrong.

First, I am looking at Vietnamese football from a distance. I do not live there. I do not see the day-to-day changes in youth training centers, in the academies that PVF or HAGL are running. It is quite possible I am missing a wave of reform that my eye, anchored in Korea, cannot see. Someone writing from Incheon about Vietnam always risks seeing an older picture than reality.

Second, I may be undervaluing a naturalized striker. I treat Xuan Son as a temporary solution, but he may well be part of a smarter long-term strategy: using naturalization to keep fans engaged while the youth system catches up. Japan did something similar in a different way, and nobody called that weakness.

Third, and this is the most important, I may be overrating the V.League. I use the record of a domestic league to judge a national team, but sometimes the national team runs ahead of the domestic league, not behind it. If that is true for Vietnam, then this piece is looking in the wrong place.

I want to bring in a third football nation as a referee for my doubts: Japan. Japanese football went through exactly the phase I am describing about Vietnam, around the 1990s, when the J.League was born and people worried it would produce players who were good domestically but not continental enough. Thirty years later, Japan is an Asian power and exports players to Germany, England and Spain in numbers no other Asian nation can match. What made the difference was not hiring a foreign coach, but building a youth system and a domestic league strong enough to stand on its own feet. When a football nation depends on an imported coach for results, it is not yet standing on its own. When it depends on a naturalized striker to score, it has not yet solved its own problem. That is the standard I use to measure Vietnam, and I admit it is a demanding one.

There is an image I cannot shake when writing about Vietnamese football. In 2026, when the pandemic froze every stadium, I sat analyzing 245 matches without fans in the Bundesliga and K League, and found that home advantage dropped sharply when the crowd noise disappeared. An empty stadium is the most honest mirror football has ever had, because it strips the match of everything except the match itself. When there is no singing, no bonuses, no crowd pressure, what remains is tactical structure and player quality. And in that mirror, many big teams suddenly looked small.

I wish we could play an AFF Cup match in an empty stadium. Not to ruin the fans' joy, but to see clearly what remains when all emotion is stripped away. If Vietnam still beat Thailand in a silent stadium, their structure is truly solid. If they won only because of the singing in the stands, then we are confusing atmosphere with ability. Data whispers while the whole stadium is screaming. I am learning to listen.

But I must also be fair. I have spent too many years repeating that I was wrong at the Russia World Cup, and I know the trap of turning a mistake into a brand. A mistake only has value when it opens a new discovery. So what is the new discovery here?

My discovery is this: Vietnamese football is in a phase where results are running ahead of the system. The national team is winning with tools its foundation cannot yet produce, and that creates a gap that will only be exposed when stronger opponents appear. Kim Sang-sik is covering that gap with tactics. Xuan Son is covering it with goals. And the AFF Cup trophy is covering it with joy.

There is nothing wrong with that joy. But a mature football nation is one that knows how to celebrate without forgetting where it stands. Koreans have a saying I hear often in Incheon: do not mistake the ceiling for the sky. Vietnam has just touched the regional ceiling. The sky is still above, and it demands more than a good coach and a naturalized striker.

What makes me optimistic, and I am genuinely optimistic, is the current generation of players. Names like Nguyen Quang Hai, Nguyen Hoang Duc or Nguyen Tien Linh are not products of luck. They are the result of a decade of investment in youth development, and they have played on stages the previous generation never had. The problem is not that they lack talent. The problem is how many more like them are being trained behind them, and whether the V.League is demanding enough to turn talent into the ability to play elite football.

I am not writing this to annoy you. I do not write to be loved. I write to be remembered, and I write because I believe a football nation only progresses when it dares to look squarely at the gap between what it has and what it thinks it has.

So what do I predict next? I think that within the next two years, Vietnam will continue to dominate Southeast Asia at national-team level, and that will lead most fans to believe the gap with the continent is closing. I think that when it faces opponents like Japan, South Korea or Iran on a truly continental stage, this team will still struggle to control the ball under high pressure, and will have to rely on set pieces and counterattacks to create chances. And I think the biggest question for Vietnamese football this decade is not who will lead the national team, but whether the V.League will dare to make itself a more demanding competition.

If I am wrong, I will write about it. I have been wrong before, and I will be wrong again. But at least I will be wrong clearly, rather than hiding behind a row of numbers or a "on one hand this, on the other hand that." Vietnamese football deserves a more honest debate than that. And the trophy in Bangkok, however beautiful, cannot place those hard questions for us.

Because the 32nd minute at Rajamangala showed us something we often forget: your star can break his leg at any moment, and when that happens, the only thing that keeps you standing is not an individual, but a system. Vietnam stood firm that night. The question for the next decade is whether they can build a system strong enough to stand firm without anyone coming to save them.