Tottenham Hotspur midfielder Dele Alli could be in hot water with the FA after appearing to punch West Brom opponent Claudio Yacob.
The incident was not addressed by the referee during the game at White Hart Lane, meaning the FA could punish him retrospectively.
Alli had scored 10 goals and provided nine assists heading into the game, and is a player Spurs will not like to be without.
The maximum punishment for the offence is a three game ban, which would end his season, and means he misses upcoming games with Chelsea, Southampton and Newcastle, with Tottenham battling Leicester for the title.
Alli was crowned PFA Young Player of the Year in an awards ceremony 24 hours earlier.
BBC pundit Jermaine Jenas gave his reaction to the video to BBC Radio 5 Live, telling the station: "It [a ban] It would be devastating for the lad and the team."
Teammate Kyle Walker was also involved in a first half altercation with Salomon Rondon, appearing to kick out, but this incident was seen by the official, who spoke to both players.