Kim Sang Sik's week of mourning: Vietnam football's real test is not about tears

One week. In a football world measured by short training camps and packed flights, a one-week absence of the man at the top of the coaching staff is a real variable. Head coach Kim Sang Sik has flown back to South Korea after his father passed away, and the Vietnam Football Federation immediately issued condolences and encouraged him to fulfil his family duty before thinking about his duty to the national team. That response is right, decent, and was received by the online community with a wave of sympathy. But when the whole world looks in one direction, I open the door they never thought to knock on. Behind that moving story lies a far drier technical question, and it will decide the fate of Vietnam at the ASEAN Cup 2026. Let us place the story in its proper time frame. Kim Sang Sik arrived in Vietnam in May 2026, taking over a hot seat that his predecessor Philippe Troussier left in a mess of impatience. In more than a year in charge, he did what recent foreign coaches in Vietnam usually fail to do: he rebuilt stability. The senior team and the U23 side produced positive results in regional and continental competitions, not by rushing the process but by installing a tactical structure simple enough for domestic players to understand and tight enough to handle Southeast Asian opponents. He was described as a man who works nonstop, almost addicted to the job, spending most of his time on training sessions and video analysis. Then the sad news arrived exactly as Vietnam were entering the final phase of preparation for the ASEAN Cup 2026, a tournament running from 24 September to 5 October. He is expected to spend about a week handling his father's funeral before returning. The president of the Vietnam Football Federation personally encouraged him to go home, and the official public message carried a wish normally seen only in the most humane moments of sport: the hope that coach Kim Sang Sik and his family can find the strength to get through this immense loss. That is the part of the story the press reports. The rest is the part the analytical tables do not show. Let us talk about the numbers first. The group draw put Vietnam in Group A alongside Thailand, the Philippines and Pakistan. This is a group with one clear summit in Thailand, one stubborn but beatable opponent in the Philippines, and one side distinctly weaker in Pakistan. With Vietnam's current standing in the region, the minimum internal expectation is to get out of the group, the realistic expectation is a semi-final, and the dream is the final. The clash with Thailand will almost certainly decide first place, and that is the match for which you need a tactical plan prepared down to the last detail. This is where one week becomes a variable. In national-team football, especially in Southeast Asia, the pre-tournament camp window is always compressed to an extreme. Domestic leagues are still rolling, players join camp in short gaps, and every session has to be decisive. When the head coach is absent for a week at this stage, the question is not whether the players care about him. The question is: who is responsible for the tactical content planned for that exact week, and whether it is delivered as originally designed. I do not prophesy. I simply look three steps ahead in the dance of chaos. And in this dance, there is something almost nobody mentions: an assistant coach can maintain training intensity, can run fitness drills, can organise opposition sessions. But an assistant cannot change the team's tactical structure without the approval of the man at the top. An assistant also cannot make bold personnel decisions, the kind that can overturn an entire plan for dealing with Thailand. In a normal training week, that is fine. But in the final week before the ball rolls at a tournament whose group contains a decisive match, those gaps accumulate into risk. Football and preparation: the same heartbeat, two different screens. When the first screen shows tears and sympathy, the second screen shows a question about the system. Has the Vietnam coaching staff already built a delegation mechanism strong enough that one week without the boss does not break the training structure? This is not a question about loyalty, nor a question about emotion. This is a question about how professional a football organisation is. I have a habit of watching Vietnam national team matches over many years, and what I have learned from pre-tournament camps is this: the difference between a Southeast Asian team that gets out of its group and one that is eliminated rarely lies in the official match. It lies in how that team handles the seven to ten days before the opening match. A session missed for logistical reasons is a session missed. A session missed because the head coach is not there to make the call is a session missed in a harder-to-compensate way, because it concerns structure, not just time. At this point, I have to say plainly something no one in Vietnamese media dares put on the table. The Vietnam Football Federation allowing Kim Sang Sik to return to South Korea is the right move in human terms. But it is also a test of the federation's own operational capacity. In the past, Vietnamese football has witnessed periods when dependence on a single coach was so great that the mere absence of that person left the entire preparation machine waiting. If that happens again, the problem is not Kim. The problem is the system. Look at the tracks ahead. If he returns after roughly a week, he will have about ten days before the opening match. That is enough time to re-establish the most important tactical sessions, enough to review opponent footage, enough to lock in the starting line-up. It is not enough to rebuild the plan from scratch, but it is enough to patch the gaps formed during the week he was away. Provided that during that week, the staff below him maintained the right intensity and the right content. That is a big condition. I forge opinions on the anvil of data, swinging the hammer bluntly. And the data here gives me a signal many overlook: in recent regional tournaments, Vietnam have usually played best when they had a tight defensive structure installed in advance and repeated across many sessions. That structure depends on detail. Detail depends on the decision-maker being present on the training pitch. Not because the assistant is not good enough, but because the authority to change structure in national-team football almost always belongs to the head coach. Now let us talk about the part I consider the biggest blind spot in this story. People are viewing this event as an emotional story, and indeed it has an emotional element. But it is also a psychological test of the squad, and that is the hardest part to control. When players learn their head coach has just lost his father, across many teams the natural reaction is to raise their effort to play for that man. This is a real effect in sports psychology, and it can generate significant short-term motivation. But it can also generate an invisible pressure: players fear making a mistake because they do not want to sadden the coach further in this sensitive period. Fear of error in a match against Thailand is the recipe for stiffness. That is why I say the test lies elsewhere. Not in whether Kim returns on time. But in whether the coaching staff and the Vietnam Football Federation have the nerve to manage that emotional state, turning it into energy rather than a burden. This does not appear on any ranking table. It appears only in how the team handles the first minutes of a big match. I do not write to convince, I write to unlock your imagination. And if you imagine the worst-case scenario, you will see it is not in the group draw, nor in the opponent's strength. The worst case is Vietnam walking into the Thailand match with a tactical plan that lost a week of fine-tuning, and with a defence playing stiff because it does not want to hurt the coach further. The best case is that this one-week absence forces the whole machine to prove it can run without a hand constantly guiding it, and Vietnam enter the tournament with a more mature system. There is one truth I believe the whole Southeast Asian football world is overlooking: regional tournaments are often decided not by the strongest team but by the team that makes the fewest administrative and organisational mistakes. Letting a head coach go home to mourn his father is a right decision. But how a federation covers the gap created by that decision is what separates a football nation mature enough to win from one that only knows how to live on emotion. I will watch the training reports in the coming days. Not to look for sad news, but to look for signs: what the team trains, who sets the tempo, and whether the structure holds. These are details nobody puts on the front page, yet they are the details that decide. Every number is a match waiting for someone who knows how to listen, and in this case, the number worth hearing is not in the scoreline but in whether Vietnam can hold the right training rhythm before the ball rolls. My prediction, for you to check against: Vietnam will get out of the group thanks to weaker opponents in the two matches other than Thailand. But the match deciding first place will depend on the quality of the tactical plan Kim manages to install in the ten days after his return. If in those ten days I read reports that the team returns to opposition drills embedded with structure, I will believe in a positive outcome. If I read that sessions are merely fitness maintenance with no sign of specialised tactical work, I will brace for worse. The question is not whether Kim can get through his grief. He will, because men who work the way he does usually get through it by throwing themselves into the job. The question is whether Vietnam football is big enough to get through it with him.