West Ham United forward Diafra Sakho is reportedly in danger of being charged by the Football Association following an alleged headbutt on Manchester United left-back Luke Shaw.
The incident is believed to have occurred during the Red Devils' 2-1 victory over the Hammers at Old Trafford on Saturday.
Shaw, who was left with a black eye, could be seen complaining to assistant referee Andrew Garrett, but neither he nor the match official Lee Mason are believed to have seen the incident.
According to The Guardian, while Shaw decided against publicly speaking about the alleged headbutt, the England international is said to be upset with his opponent's actions.
The FA could take retrospective action once they have received Mason's report this morning.