Vietnam face new test at FIFA ASEAN Cup 2026: The time puzzle and Kim's adaptability

On September 26, the Vietnam national team will step into their opening Group B match of the FIFA ASEAN Cup 2026 against the Philippines in Indonesia. As the defending champions, Vietnam aims to retain the title, but this journey faces an unprecedented challenge: extremely limited preparation time due to the congested schedule of players from Cong An Ha Noi (CAHN) club. Can coach Kim Sang-sik adapt and turn the situation around?

1. Context and schedule

According to the Vietnam Football Federation (VFF), the national team will gather from September 21 to prepare for the match against the Philippines. However, the issue is that many key players are currently playing for CAHN – a club participating in the AFC Champions League Elite and V-League. Specifically, CAHN will face Osaka (Japan) in the Champions League Elite on September 15, followed by a match against Dong Nai in V-League round 3 on September 20. Thus, CAHN players such as Quang Hai, Dinh Bac, Nguyen Filip, Van Hau, Van Do, Thanh Long, Quang Vinh will only have about 5-6 days to train with the national team before departing for Indonesia (where Group B matches will be held). Meanwhile, coach Kim theoretically has about 2 weeks to work with the full squad, but in reality, time with key players is very limited.

This is a significant departure from previous ASEAN Cup editions, where Kim typically had about 3 weeks of full-squad preparation. This disparity in preparation time raises major questions about the team's tactical execution in the opening match.

2. Tactical challenges for coach Kim

Kim Sang-sik, who led Vietnam to the 2026 ASEAN Cup title, is known for his possession-based style, high pressing, and quick transitions. However, to run this system smoothly, he needs time to refine combinations, especially set pieces and coordinated pressing. With CAHN players having only a few days of training, the team will likely have to simplify tactics, prioritizing defensive solidity over attacking fluency. This could lead to a more pragmatic approach, relying on fast counter-attacks and exploiting opponent errors.

According to expert analysis, the lack of training time will directly affect coordinated pressing. In recent friendlies, Vietnam still showed several technical issues to improve. With limited time, these issues are unlikely to be fully resolved before the tournament.

3. Impact of missing CAHN players

CAHN has supplied many players to the national team in recent times. This concentration of resources from a single club creates a major integration bottleneck. The seven named players are all key figures in Kim's tactical setup. Having only a few days with the national team means the starting XI against the Philippines may never have played together in a full competitive match. This poses significant risks in coordination, especially in defensive and attacking organization.

Notably, CAHN's schedule is very congested: the Champions League Elite match against Osaka on September 15, followed by the V-League match against Dong Nai on September 20. Players will have to travel and compete at high intensity before joining the national team, affecting their fitness and morale.

4. Fitness and load management

Another major challenge is the fitness of CAHN players. After intense matches in the Champions League Elite and V-League, they will enter the national team camp not in optimal physical condition. Meanwhile, other players who have been in camp longer may have different fitness peaks, creating an imbalance in the squad. This complicates Kim's ability to implement a high-intensity pressing system. Without proper adjustments, the risk of injury and fatigue in consecutive matches is high.

According to fitness experts, playing with such a dense schedule can lead to overloading, especially for players who travel a lot. Kim needs a proper load management plan, possibly rotating the squad in group-stage matches to preserve energy for more important knockout games.

5. Comparison with previous ASEAN Cup editions

In the past, Kim typically had more time to prepare for major tournaments. For example, before the 2026 ASEAN Cup, he had about 3 weeks of full-squad training, allowing him to build a cohesive team and execute tactics smoothly. This time, the difference in time is huge, raising questions about the Korean coach's adaptability. Can he find solutions to overcome time constraints, or will he have to accept a subpar performance?

Notably, in previous editions, Kim had thorough tactical preparation with long training camps and quality friendlies. This time, due to overlapping schedules, he does not have those ideal conditions. This requires him to be more flexible, possibly accepting a simpler but effective style of play.

6. Public pressure and expectations

As the defending champion, Vietnam always receives great expectations from fans. However, this pressure increases when facing preparation difficulties. If the team performs poorly, Kim will face criticism from media and fans, affecting the whole team's morale. However, if he overcomes this challenge, his reputation will be further strengthened.

Pressure is not only on Kim but also on CAHN players. They are expected to shine but have little time with the national team. If the team underperforms, they could become the focus of criticism, creating significant psychological pressure.

7. Analysis of the Philippines and other opponents

The Philippines, Vietnam's first opponent in Group B, is not traditionally among ASEAN's elite, but they are expected to field their strongest squad. With better preparation time, the Philippines could spring a surprise. This match is seen as the first hurdle where Vietnam needs to secure all three points to build momentum for subsequent matches. A slip-up would put immense pressure on Kim's side.

Besides the Philippines, Group B also includes Indonesia, Singapore, and Myanmar. Indonesia is considered a direct competitor for the top spot. With home advantage, Indonesia will be a tough challenge. Singapore and Myanmar have also shown significant progress in recent years.

8. Predictions and conclusion

Despite difficulties, with their class and squad depth, Vietnam is still rated higher than the Philippines. However, a narrow victory is entirely possible. The key is for Kim to make reasonable tactical adjustments, using the limited training days optimally to build a stable core. If he does that, Vietnam can advance from the group stage and go deep into the tournament. Conversely, if the time problem is not solved, the title defense journey will face many obstacles.

It is clear that the FIFA ASEAN Cup 2026 is not just a test of Vietnam's ability, but also a test of Kim's adaptability when he no longer has the luxury of ideal preparation. Can he turn difficulties into opportunities to assert his class? The answer will come in the coming days.

9. In-depth tactical perspective

According to data from recent Vietnam matches, Kim often uses a 3-4-3 or 4-3-3 formation with high demands on pressing and quick ball circulation. However, with short preparation time, implementing complex tactical requirements will be difficult. Players need time to understand each other, grasp positions, and coordinate smoothly. This is especially important in set pieces, where understanding between players is crucial.

One solution Kim could apply is using a 4-4-2 or 4-2-3-1 formation, with two deep central midfielders to strengthen defense. This gives the team more solidity in the early stages of the tournament before gradually increasing tactical complexity in later rounds.

10. Impact of missing key players

The prolonged absence of key players can affect team cohesion. However, this is also an opportunity for young players to shine. Kim can give chances to new faces who have been training with the team from early on. This not only increases competition but also brings freshness to the playing style.

A positive point is that CAHN players are accustomed to high-intensity matches in the Champions League Elite, giving them confidence and international experience. They can pass on this experience to teammates during the short training period.

11. Conclusion

The FIFA ASEAN Cup 2026 is a major challenge for Vietnam and coach Kim Sang-sik. With limited preparation time, achieving good results will require flexibility, creativity, and high adaptability. However, with squad quality and an experienced coach, fans can hope for a successful tournament. The key is a good start, and the match against the Philippines will be an important stepping stone for the whole tournament.