On FIFA rankings, Iran are 22nd and only behind Japan in Asia. Their Olympic team don't have the same power as the senior, but are always highly rated at Asian Games. They have won gold medals four times and entered the round of 16 at the most recent edition in Jakarta in 2018.
Facing the strongest team of group B, Vietnam will have to get a different approach compared to the last game against Mongolia and hope to earn at least one point, in order to increase their chance of moving past the group stage.