U23 Korea and Nine Europe-Based Players: U23 Vietnam Face the Height Equation in the Asiad 20 Quarter-final

In the squad list U23 Korea submitted to the organisers of Asian Games 20, there are nine names that are not followed by the name of any K League club. Those nine names sit in England, Scotland and Wales, where a shoulder-to-shoulder duel is treated as a matter of survival and an aerial ball is an everyday mode of transport. That list is the first document anyone wanting to talk about the men's football quarter-final between U23 Vietnam and U23 Korea must read, ahead of any head-to-head numbers. The match kicks off at 17:30 Vietnam time on 25 September at Paloma Mizuho Stadium in Nagoya, Japan.

In January this year, in the third-place match of the 2026 AFC U23 Asian Cup, the two sides drew 2-2 after 120 minutes of regulation and extra time, and U23 Vietnam won on penalties. That memory is intact, but its value as a reference for the coming match is low. The squad Korea have brought to these Asian Games is almost entirely different from the one they fielded at the U23 Asian Cup.

The difference lies in objectives. U23 Vietnam, together with U23 Japan and U23 Uzbekistan, have brought a young group to Asian Games 20, most of them aged 21, pointing towards the Los Angeles 2028 Olympic Games. U23 Korea are not here to experiment. They are here to win gold. Across the last three Asian Games, in 2026, 2026 and 2026, the Korean side finished top of the men's football podium. To sustain that position, they keep using a familiar method: calling up overage players, and bringing back those playing in Europe.

This time, U23 Korea have three overage players. Midfielder Lee Gi Hyuk, 26, plays for Gangwon FC. Yang Hyun Jun, 24, plays for Celtic in Scotland. Eom Ji Sung, 24, plays for Swansea City in England. These three carry professional match experience that most U23 Vietnam players have never touched.

But the most visible factor remains physique. The Korean goal is guarded by goalkeeper Kim Joon Hong, 1.90m tall. In front of him is a back line of Park Seong Hoon (1.83m), Kim Jo Soo (1.92m) and Shin Min Ha (1.86m). In midfield there is central midfielder Lee Gi Hyuk (1.84m) and wide midfielder Park Seung Soo (1.84m). Up front, Lee Young Jun stands 1.93m and Kim Myung Jun 1.82m.

Compare that with U23 Vietnam, whose starting line-up so far in the tournament has usually contained only two players above 1.80m: goalkeeper Cao Van Binh (1.84m) and centre-back Pham Ly Duc (1.82m). The rest are noticeably shorter. A height gap does not automatically become goals, but it decides who gets to take position first in every aerial situation, and who must jump from a disadvantaged stance.

The concern is not the aerial duels themselves, but the second ball that drops afterwards. When a Vietnamese centre-back contests with Lee Young Jun, the question is not who wins that particular duel, but who owns the ball when it comes down. Korea hold a double advantage here: the man contesting is taller, and the players waiting around him are bigger too. East Asian teams often drive long balls into the space behind the wide centre-backs, not necessarily to score immediately, but to push the opposing defensive line deeper and then take over the second line.

With the speed-and-power approach of the group playing in the United Kingdom, Korea will most likely take a direct route, few touches, sending the ball into the two corridors and crossing early. That kind of attack does not need many combination passes; it needs heads and shoulders. In the group stage, U23 Vietnam dealt with aerial balls mainly by marking in front and clearing long; that was enough against opponents of similar stature, but against a front line with three players above 1.82m, every inaccurate clearance becomes another attacking sequence for the opponent.

Over more than eleven years of watching youth matches, I have drawn one conclusion that rarely shows up on the scoreboard: small teams do not lose because of the duels, they lose because of the number of duels they are forced to take part in. Every corner, every throw-in in their own half, every long ball that escapes control is one more moment when the defensive line must choose between tracking a man and holding shape. Choose wrong once and a goal arrives; choose right twenty times and stamina drains, until by the 70th minute there is no strength left to choose correctly.

On the other side, the Korean press is cautious. The Daum newspaper wrote that U23 Korea cannot be complacent against U23 Vietnam, because this opponent has risen as an awkward force in Asian football thanks to a solid defensive style and their characteristic team spirit. The paper also suggested that the absence of coach Kim Sang Sik is acting as a catalyst driving the competitive spirit of the Vietnamese players, even though the team is still run on the tactical framework he left behind: solid, pragmatic and intensely pressing.

Seen the other way, I would argue that nine players from Europe are a conditional advantage, and the conditions may not yet be met. These players join up late, after the seasons in England and Scotland have already begun, so preparation time is compressed. A collective made up of men from different systems, meeting for a few sessions before a knock-out match, usually starts with disjointed passages rather than a unified block. Add the pressure to win gold, which three consecutive Asian Games have turned into an obligation, and U23 Korea walk into this match as a side that is not allowed to make a mistake.

Height only becomes a genuine disadvantage when the match is chopped up into many stoppages. If U23 Vietnam can keep the rhythm continuous, let the ball mostly roll on the grass, limit fouls in their own two-thirds and choose to play the ball wide instead of launching it long, the height gap compresses. The task of the Vietnamese defence is not to win aerial duels, but to reduce the number of aerial duels. Where nobody is looking, football still whispers stories yet untold: a shorter back line can still stand firm, if it forces the opponent to play its way.

People tell me I go looking for treasure; I am only listening to people who have been forgotten. For a squad pointing towards Los Angeles 2028, the quarter-final at Paloma Mizuho Stadium is worth more than a semi-final ticket. This is the first time most of these young Vietnamese players get to measure pace, measure the intensity of physical contact and measure their own fear against an opponent built to European standards. Matches like this do not produce stars immediately; they only record who is still standing after the final whistle.

Golden generations are not born on their own – they are excavated from the mud. The probability of U23 Vietnam winning over 120 minutes is low, and there is no need to hide that. But if in that match three young players walk out of every shoulder-to-shoulder duel without losing their position, what is gained is larger than a result. When the whistle sounds in Nagoya, what deserves a line in the notebook is not the score, but how many Vietnamese names have touched the physical and speed standard of continental football — and how much distance remains to be closed.