West Brom's Chris Brunt was involved in a heated exchange with his own fans after appearing to be hit by an object following their 3-1 defeat at Reading.
The left-back had gone over to applaud the visiting fans following their FA Cup fifth round exit but went down clutching his face as he approached the away end.
Northern Ireland international Brunt then confronted a group of Albion fans before being led away by captain Darren Fletcher.
Brunt said a coin had been thrown at him by the fans.
In comments reported by BBC Sport, the 31-year-old said: "I was walking towards our supporters at the end, and they thought it was okay to throw a coin at their own players. I'm disgusted.
"If they want to come forward and say they don't like what they've seen then that's fine. Fans are frustrated we were 1-0 up and lost.
"They paid a lot of money to come, but a small minority spoilt it. There were young kids there. I was absolutely disgusted and ashamed."