Thames Valley Police and the Football Association are investigating after a coin was thrown at West Bromwich Albion player Chris Brunt after their defeat in the FA Cup away at Reading.
The club have called the behaviour of a few of their travelling fans "sickening, barbaric and criminal."
"After the game, a West Bromwich Albion player was struck by an object thrown from the crowd. The player was treated for a cut to his face by medical staff at the stadium. We will be speaking to the player in due course to discuss the matter."
"The FA is investigating the incident in which an object was thrown from the crowd at Chris Brunt at the end of the Reading v West Bromwich Albion game as well as the crowd disturbances in the away section of the stadium. We strongly condemn any such behaviour and will work with both clubs and the authorities to identify those responsible."
West Bromwich Albion have labelled the behaviour of a few of their travelling fans at the end of their FA Cup fifth round defeat at Reading as "sickening, barbaric and criminal."
West Brom player Chris Brunt was struck beneath his left eye by a coin at the end of their 3-1 loss.
The club says they are working with all relevant authorities to identify the offender.
We are working with all the relevant authorities to identify as quickly as possible the offender, who can expect the severest of sanctions by the Club for his actions.
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.
Brunt 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.
The Northern Ireland international then confronted a group of Albion fans before being led away by captain Darren Fletcher.
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."
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