(CNN) -- Craig Bellamy is under investigation by the English Football Association over his confrontation with a fan at the end of the Manchester derby at Old Trafford on Sunday.
Bellamy celebrates his late equalizer but it all turned sour minutes later.
Bellamy, who scored two superb goals for City, including their third equalizer on the stroke of full-time, was left distraught as United scored an injury-time winner through Michael Owen.
As the final whistle blew, a fan invaded the pitch, to be tackled by stewards.
He appeared to taunt Bellamy, who walked in his direction and shoved a hand in his face, all captured by television cameras.
An FA spokesman said on Monday: "We are investigating the incident and we will be looking at the referee's match report."
A decision on whether to charge Bellamy will be made in the next 24 hours and he is also under investigation by Greater Manchester police over the incident.
Manchester United could also be in trouble after City substitute Javier Garrido was struck on the head by a coin as he headed down the tunnel at half-time.
Sunday's hotly-contested English Premier League matches were full of incident and controversy and Blackburn player El Hadji Diouf is also being investigated by the FA and the police over an altercation with a ball boy in their 3-0 defeat at Everton.
Diouf was interviewed by police in a private room at Goodison Park an hour after yesterday's match after allegedly using racist abuse towards the ball boy.
An FA spokesman added: "We are aware of the incident and are awaiting reports from the match official. We will also be speaking with the police to establish what their inquiries are in the matter."