FIFA have charged a South Korea player after he displayed a flag with a political message during his side's bronze medal win over Japan in Cardiff.
Jongwoo Park allegedly displayed a banner supporting sovereignty of a group of islands that is disputed territory between the two countries - political messages are banned at the Olympics.
A FIFA spokesman said: "In view of the information currently at his disposal, the chairman of the FIFA disciplinary committee has this afternoon decided to open disciplinary proceedings against the player Jongwoo Park, regarding his behaviour after the match played between the Republic of Korea and Japan on August 10.
"The KFA and the player now have a deadline of August 16 to provide their position. Further information will be provided in due course."