The game starts at 5 p.m. Hanoi time.
Vietnam are in a comfortable position ahead of their last group-stage game with six points thanks to victories over Australia and Qatar. If they win or draw against Iran, who are having three points, they will secure the top spot of group B and enter the quarterfinals.
If Vietnam lose 2-3, they will still advance thanks to the goal advantage. Any defeat with other scores will leave Vietnam's chance to be decided by other teams. When that happens, Vietnam will advance if Qatar (zero points) win, draw or do not lose big to Australia (three points).
On the other side, losing 2-3 against Australia after defeating Qatar in the first game left Iran with only one choice, which is to beat Vietnam.