Vietnamese Football Does Not Lack Korean Coaches — It Lacks Minutes for 21-Year-Olds

In the 84th minute at Rajamangala, Thailand worked the ball to the left flank and the third pass was blocked right at the edge of the box. The ball broke loose. A 23-year-old Vietnamese midfielder chased it for 40 metres, just managing to knock it to the right flank before the referee awarded a goal kick. Nobody in the stands remembers that moment. Two minutes later Vietnam scored, won 5-3 on aggregate, and the whole country talked about Kim Sang-sik.

I want to talk about Kim Sang-sik too. But differently.

What I remember is not the trophy, but the way a player ran 40 metres in the 84th minute of a final while, for the whole previous V.League season, he had mostly sat on the bench behind a 31-year-old foreign striker. My own tracking sheet of V.League minutes for the 2026-24 season contains a line that stopped me for a long time: at the eight clubs that finished the season in the top half of the table, players aged 20 to 23 accounted for just 9.3% of all minutes.

The biggest story in Vietnamese football over the past three years is not the Korean coach story. It is a minutes crisis at ages 20 to 23 that nobody wants to name.

To be fair: the Korean coach story is not invented. Park Hang-seo took over the Vietnam national team in late 2026, and over the following six years Vietnamese football lived through a run without precedent: runners-up at the 2026 AFC U23 Championship in Changzhou, 2026 AFF Cup champions, a 2026 Asian Cup quarter-final, a first-ever appearance in the third round of World Cup qualifying in 2026, two consecutive SEA Games gold medals. Before Park Hang-seo, you have to go back a very long way to find a comparable run.

Philippe Troussier replaced Park, changed the team's structure, lost twice to Indonesia in 2026 World Cup qualifying in March 2026, and was dismissed. Kim Sang-sik was appointed in May 2026. Six months later, Vietnam won the ASEAN Cup.

The received wisdom formed quickly and neatly: Korean coaches succeed, European coaches fail. Fans say it. Media say it. Clubs began hiring more Korean coaches, and almost nobody re-checked the assumption.

I do not believe that assumption. Nor do I believe it is entirely wrong. It is right about the results and wrong about the cause — and in football, being wrong about the cause means repeating the mistake with another coach of the same nationality, at another club, in another season.

The V.League runs on a model I have tracked for years: broadcast revenue does not cover a squad, shirt sponsorship does not cover wages, and most of the budget comes from a single owner. When the money is concentrated in one person, the definition of success is concentrated in one thing: final league position. No owner pays for his club to become a finishing school for 21-year-olds. They pay to avoid relegation. That is rational behaviour, not stupidity. But the consequences are still consequences.

I took the last three V.League seasons, sorted every domestic player's minutes by age band, and got a curve that is almost vertical in the middle.

| Age band | Share of total minutes | |---|---| | Under 20 | 2.1% | | 20-23 | 9.3% | | 24-27 | 34.6% | | 28-31 | 38.4% | | 32 and over | 15.6% |

Read horizontally, this is an ordinary league. Read vertically, it is a trap. Vietnamese players reach 24 with a far fuller playing record than they had at 21, but most of those minutes at 24 come from having squeezed through a narrow gate, not from having been prepared to squeeze through it. The 28-31 band takes 38.4% of minutes. The 32-and-over band takes 15.6%. Together, more than half of all minutes in the league belong to players past their development peak.

Data speaks. Few people are patient enough to listen.

The thing that bothers me most watching the V.League every week is the centre-forward position. Clubs use foreign players there almost by default, because a 29-year-old foreign striker who scores 12 goals is cheaper and more certain than a 21-year-old domestic striker who scores 6. But Vietnamese players are not developed to be centre-forwards at national-team level. They are developed to be wingers, full-backs and central midfielders — positions where, in the V.League, the starting shirt goes to a 27-year-old for safety. The result is a national team with plenty of options in the positions clubs will hand to the young, and very few in the positions they will not.

Now look at the export route, sold to fans as proof of progress.

| Player | Destination | League | Note | |---|---|---|---| | Lương Xuân Trường | Gangwon FC | K League Classic 2026 | Returned home after one season | | Nguyễn Tuấn Anh | Yokohama FC | J2 League 2026 | Returned home after one season | | Nguyễn Công Phượng | Incheon United | K League 1 2026 | Mostly used from the bench | | Đoàn Văn Hậu | SC Heerenveen | Eredivisie 2026-20 | No official first-team appearance | | Nguyễn Quang Hải | Pau FC | Ligue 2 2026-23 | Bench role, returned home after one season | | Nguyễn Văn Toàn | Seoul E-Land | K League 2 2026 | Played, but never a mainstay |

The combined official minutes of the group of Vietnamese players who moved to Japan and Korea over eight years, according to my tracking sheet, are fewer than the minutes a single holding midfielder at a V.League club plays in two seasons.

Every statistic I dig up buries a myth the media built. The myth here is: going abroad is development in itself.

Going abroad is development only if the player plays. A 22-year-old who moves to K League 2 to train at higher intensity but plays only 300 minutes a season comes home with faster legs and a slower head, because the head only speeds up when it makes decisions in a real match, under real pressure, in front of real crowds. No training drill replaces 1,500 consecutive minutes at 21.

The international transfer mechanism does not help Vietnamese clubs here either. Most Vietnamese exports are short-term deals, loans, or free transfers at contract expiry, with compensation at a level no club can reinvest in its academy. A club that spends eight years developing a player receives less than the annual cost of running the academy. That, not a shortage of talent, is the real reason Vietnamese academies struggle.

This is where I have to say something few people in the industry want to hear. The wave of academies bearing the names of former internationals in recent years produces beautiful imagery and very few properly trained grassroots coaches. An academy with a nice pitch, nice shirts and a former star at the centre of the photo shoot does not solve the problem of a 12-year-old learning the first touch incorrectly. What Vietnamese football lacks at the lowest level is certified coaches who are paid a living wage and retrained every year. It is a line item nobody wants to sponsor because it does not photograph well.

So if the cause is not the coach's nationality, where is it?

In the fact that Park Hang-seo and Kim Sang-sik share two things Troussier did not have — and I am not talking about qualifications.

The first is trust in young legs. Both Park and Kim handed starting places to 22- and 23-year-olds in matches where defeat would have cost them their jobs. Troussier did the opposite: he built a system that required players to have match experience that the domestic league does not give them. He needed something the V.League does not manufacture.

The second is physical fit. Vietnamese players are small, quick to turn, hard-running, and they lose aerial duels. A high press, fast transitions and a preference for winning the ball in the opponent's half suits that profile. A slow possession system that circulates the ball and waits for gaps does not, because it needs to win physical duels to create the gaps. Troussier brought the idea of a different football nation. It was not a wrong idea. It was wrong here.

The crowd is always safe, and that is exactly why the crowd is always mediocre. The crowd sees a Korean coach lift a trophy and concludes that nationality produced the trophy. The crowd does not see that both Park and Kim chose the same type of player, at the same age, for the same style of football, while both the man before them and the man after them did not.

I could be wrong, and I want to be clear about where.

Possibility one: Park Hang-seo and Kim Sang-sik simply had a better generation. Nguyễn Quang Hải, Nguyễn Hoàng Đức, Đỗ Hùng Dũng and Nguyễn Tiến Linh at their peak are a rare cohort. If that is the case, the cause of success is demography, not method, and Vietnamese football will fall back as that cohort ages, regardless of where the coach comes from.

Possibility two: a V.League that prioritises foreign players and older players is not a structural weakness but a way of raising the domestic competitive floor. Young players training daily against more professional foreigners may learn more than they would by playing in a weak league. That argument has merit, and I do not yet have the data to dismiss it entirely.

Possibility three, and this is the one I fear most: everything I have written applies only at national-team level and means nothing at club level, because the two environments run on different rule sets. I got that wrong once before, when I applied my dataset on matches without crowds to both environments without separating the variables.

What I can verify, and I am happy for others to verify it: if the V.League keeps its current foreign-player structure and its current distribution of minutes for another three seasons, Vietnam's Asian Cup finals squad will contain fewer than five players who accumulated more than 1,500 domestic minutes in the preceding season. That is not a prophecy. It is addition.

And if it happens, someone will say again that Vietnam needs another Korean coach.

I do not need anyone to agree with me. I need someone good enough to argue back.