Police have made an arrest as they investigate the incident that saw West Brom's Chris Brunt hit by a coin.
The midfielder appeared to be struck as he approached his own club's fans following Albion's 3-1 FA Cup defeat at Reading on Saturday.
West Brom boss Tony Pulis has refused to commit his future to The Hawthorns.
The manager's contract expires in 2017 but he has offered no assurances he will stay and will seek talks with chairman Jeremy Peace in the summer.
Pulis has come under fire from fans after Saturday's 3-1 FA Cup defeat at Reading and tempers boiled over when Chris Brunt was hit by a coin thrown from the Albion section following the final whistle.
He told the BBC: "Let's get through the season, let's sit down and see where we go from there. The most important thing is to try and keep the club up in the Premier League.
"I'll sit down with Jeremy and we'll take it from there."
Pulis has been in charge since January 2015, replacing Alan Irvine, signing a two-and-a-half year deal. Albion are 14th in the Barclays Premier League but have won just twice in their last 11 games in all competitions
Chris Brunt insists he could have been blinded after being hit by a coin thrown from West Brom's own fans.
The Northern Ireland international was hit under his left eye by a coin thrown from the visiting section as he went to hand his shirt over to a Baggies supporter following their 3-1 FA Cup defeat at Reading on Saturday.
The police are treating the incident as assault with the Football Association also investigating while Press Association Sport understands Albion will issue a lifetime ban to anyone found guilty.
Brunt was then involved in a heated exchange with a group of fans and believes the coin may have blinded him.
"It could have done but it is done now, you can accept criticism and accept people having a go at you in games for not playing well individually or as a team but you can't accept people throwing stuff," he said.
"I can't pick that coin up and throw it back at him. If I did that I would be all over the news and probably sitting in a police cell. It is definitely not on.
"I was pretty angry in the heat of the moment. I didn't see what happened, I turned around and got hit by a coin. I don't know who threw it , I don't know where it came from. It is a brave man to throw a coin from there and a braver man if he admits to it.
"I don't really see how that was any different to whacking someone in the street. We are not allowed to do it and nobody is allowed to do it in the street so why should he be allowed to throw coins at football matches?
Brunt does not expect anyone who threw the coin to apologise to him despite widespread condemnation about the incident.
He said: "Probably not, but it would show and make him a bigger man than what he was to throw a coin from 20 yards away to hit me in the head if he owned up to it. You are throwing football back 20 years with some of the behaviour there.
Alan Cleverley from the West Bromwich Albion Supporters Trust has described yesterday's coin throwing incident as "appalling and despicable."
West Brom player Chris Brunt was struck beneath his left eye by a coin at the end of their 3-1 loss away at Reading.
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."
West Brom have agreed a loan fee with QPR that would see Sandro move to the Hawthorns until the summer.
The Brazilian midfielder has been plagued by injuries since leaving Spurs for the Super Hoops in September 2014.
He is expected to undergo a medical in the West Midlands today and could be available for West Brom's Premier League fixture against Swansea on February 2nd.
Aston Villa's mini revival continued at West Brom but they were denied a first-half penalty in a goalless drawRead the full story ›
West Bromwich Albion and Aston Villa are both through to the fourth round of the FA Cup after winning their third round replay ties tonight.
But Northampton Town are out of the competition after losing to Championship side MK Dons.
West Brom scored the only goal of their game, Salomon Rondon scoring to secure victory over Bristol City. They'll face Peterborough in the next round.
Aston Villa are also through after beating League Two side Wycombe and take on Manchester City in the fourth round.