Vietnam face new test at FIFA ASEAN Cup 2026: Kim Sang-sik's time puzzle

When the opening whistle of Group B at the FIFA ASEAN Cup 2026 between Vietnam and the Philippines sounds at a stadium in Indonesia on September 26, coach Kim Sang-sik may have to field a lineup that has never played a single official match together. Seven CAHN players – Quang Hai, Dinh Bac, Nguyen Filip, Van Hau, Van Do, Thanh Long, Quang Vinh – are expected to have only a few days of team training before departure. This is not an ideal scenario for a defending champion, but rather the harshest time puzzle in the Korean strategist's coaching career in Vietnam. According to the schedule, CAHN still has two important matches before releasing players to the national team: against Osaka in the Champions League Elite on September 15 and against Dong Nai in the V-League on September 20. Thus, these core players will only have about 5-6 days of training with the national team before traveling to Indonesia. Meanwhile, coach Kim Sang-sik theoretically has about two weeks to work with the full squad, but in reality, the full assembly time is significantly shortened. This is a major difference from previous ASEAN Cup editions, when he had better preparation conditions and more time. The core issue is not tactical design, but integration time. Kim's system – often a 3-4-3 or 4-3-3 favoring ball control and quick transitions – requires coordinated pressing triggers and positional discipline. With CAHN players having only a few days of training together, cohesion in set pieces and pressing coordination will almost certainly be affected. Not to mention, the team still has "several technical issues to improve following the ASEAN Cup 2026" as the article mentions. With limited time, these issues are unlikely to be thoroughly resolved before the opening match. Physical conditioning is also a major challenge. CAHN players come from a congested schedule: Champions League Elite on September 15, V-League on September 20, then the national team on September 26. The risk of injury and accumulated fatigue is real. Meanwhile, non-CAHN players who have been in camp longer may have different fitness peaks. This asymmetry makes implementing a high-intensity pressing system risky. Another notable point is the heavy reliance on CAHN. The police club has supplied many players to the national team in recent times. This creates a bottleneck: if CAHN has a congested schedule, the national team is directly affected. This is a unique structural feature of Vietnamese football, which few regional rivals face to the same degree. However, there is a contrarian view. Is this really a major disadvantage? CAHN players are already familiar with Kim Sang-sik's system through previous training camps. They are not strangers to his philosophy. In fact, playing together at CAHN may create a certain chemistry when they join the national team. The issue is only the integration time with players from other clubs. If Kim chooses to simplify tactics, prioritizing solidity over flair, then 5-6 days may be enough to operate a basic defensive counter-attacking system. The Philippines, though expected to field their strongest squad, is not a formidable force in the region. A draw or a minimal win is still a viable scenario. The biggest question is not whether Vietnam will advance from the group stage, but whether coach Kim Sang-sik can prove his adaptability when he no longer has ideal preparation conditions. If the team still performs convincingly despite the short assembly time, it will be a strong signal of his tactical depth. Conversely, if the performance is poor, pressure will mount on the Korean strategist. The match against the Philippines on September 26 will be the first test, and also the most important one so far. To better understand this challenge, we need to look back at recent ASEAN Cup editions. At the AFF Cup 2026 (held in late 2026), coach Kim Sang-sik had significantly more preparation time. The team assembled early, had friendly matches, and extended training camps. The result was a convincing championship. This time, with FIFA incorporating the ASEAN Cup into the official competition system, the schedule is compressed, creating conflicts with club-level competitions. CAHN, as a team participating in the Champions League Elite, must prioritize the continental front. This is entirely understandable commercially, but it puts the national team in a difficult position. The reliance on CAHN is not new. In recent years, CAHN has become a major "supplier" for the national team. Besides the seven names mentioned, there are other players like Ho Tan Tai, or previously Doan Van Hau. This shows a concentration of resources into a single club. If CAHN faces financial difficulties or changes direction, the national team will be severely affected. This is a structural risk that the VFF needs to consider. Tactically, coach Kim Sang-sik is known for his flexibility. He has used various formations, from 3-4-3, 4-3-3, to 4-2-3-1. However, his core philosophy is ball control and high pressing. With limited time, he may have to switch to a more pragmatic style, prioritizing defensive solidity and taking advantage of opportunities. This may reduce entertainment value but increase the chance of earning points. In a short tournament, results matter most. The Philippines, the first opponent, has made significant progress in recent years. They have many naturalized players, good physicality, and a direct playing style. However, they still lack the consistency of top Southeast Asian teams. If Vietnam plays to their potential, victory is well within reach. But if the squad is not ready, an unfavorable result is entirely possible. History shows that in short tournaments, teams with better preparation often have the advantage. Another factor to consider is the fitness of CAHN players. They have just gone through a long season with a dense match schedule. The match against Osaka in the Champions League Elite will certainly be intense, requiring high physical and mental demands. Then they have to play in the V-League on September 20 before joining the national team. The risk of injury is high. If one of them gets injured, Kim's plans will be disrupted. This is a risk the coaching staff needs to anticipate. For the VFF, they need long-term solutions to resolve scheduling conflicts. CAHN's participation in the Champions League Elite is a positive signal for Vietnamese football, but it also raises the issue of coordination between parties. Special agreements or adjustments to the domestic schedule may be needed to prioritize the national team. However, this is not easy because clubs also have their own interests. Looking broadly, Vietnamese football is in a period of strong development. Having a representative in the Champions League Elite is a big step forward. However, this development also brings new challenges. Balancing club success and national team performance is a difficult problem, not only for Vietnam but also for many other countries in the region. Coach Kim Sang-sik, with his vast experience, will certainly have solutions. But does he have enough time to implement them? That is the big question. In that context, the match against the Philippines on September 26 is not just an opening match, but a test of the management and adaptability of the entire system. If Vietnam wins convincingly, all concerns will disappear. If not, pressure will weigh heavily on the whole team. Let's wait and see. Among the seven CAHN players, Quang Hai is the most prominent name. He is the team's conductor, the one who regulates the tempo of the match. With only a few days of training, Quang Hai will find it difficult to connect well with other midfielders like Hoang Duc or Nguyen Quang Hai (if called up). However, his vast international experience can help him adapt quickly. The issue is the chemistry with new teammates. Nguyen Filip, a naturalized goalkeeper of Czech origin, is an important addition. He has good reflexes and good ball-playing ability, suitable for a possession-based style. However, having little time to train with the defense may affect coordination in set-piece situations. This is a risk that needs to be managed. Van Hau, the left-back, has returned from a long injury. He is one of the best defenders in Southeast Asia. However, his fitness remains a question mark. Playing continuously in a short period could put him at risk. Kim needs a backup plan. Young players like Dinh Bac, Van Do, Thanh Long, and Quang Vinh also play important roles. They are the future of Vietnamese football, but their international experience is still limited. Playing in a major tournament with short preparation time could affect their mentality. However, this is also an opportunity for them to prove themselves. According to statistics, Vietnam and the Philippines have met 10 times in history, with 7 wins for Vietnam, 2 draws, and 1 loss. In recent matches, Vietnam has usually dominated. However, in the current context, these numbers are not very meaningful. The Philippines is improving, and they will play with nothing to lose. One notable point is that the FIFA ASEAN Cup 2026 involves FIFA, which may mean matches count towards the FIFA rankings. This increases competitiveness, as teams will want to improve their standings. Vietnam is currently ranked 116th in the FIFA rankings, while the Philippines is 139th. A win would help Vietnam improve their position. In summary, the biggest challenge for Vietnam at the FIFA ASEAN Cup 2026 is not the opponent, but time. With CAHN players having only a few days of assembly, coach Kim Sang-sik needs to make smart tactical adjustments. He may choose a pragmatic style, prioritizing solidity. If he does that, Vietnam remains the number one candidate for the championship. But if not, things could become difficult. The match against the Philippines will give us the first answer. And then, when the ball rolls on the Indonesian pitch, all the worries, calculations, and tactics will be put to the test. Will coach Kim Sang-sik turn limitations into advantages? Will CAHN players show their class despite only a few days of training? All will be answered at 19:00 on September 26. Let's wait.