Chelsea have labelled Didier Drogba's decision to throw a coin back at Burnley fans as "inexcusable".
Chelsea lost the Carling Cup fourth-round tie clash with the Clarets 5-4 on penalties and Drogba issued a post-match apology for his actions, but the 30-year-old is almost certain to be fined by the club once investigations by the Football Association and the police have been completed.
A statement from Chelsea read: "We welcome Burnley's assistance in trying to help identify the small minority of their support who spoiled a great occasion for their club. Although Didier Drogba was hit by an object, that does not excuse his subsequent actions."
He added: "He also recognises that, has not sought to justify it that way, has sincerely expressed his regret and has apologised for the incident.
"The matter will be dealt with internally by the club after the FA and police processes are completed."
The FA on Friday charged the striker with violent conduct and he could face a three-match ban if he is found guilty.
An FA spokesman added: "Players should be able to play football without fearing for their personal safety. It is totally unacceptable for players to be put in danger by supporters throwing missiles onto the pitch.
"The priority now is to work with the clubs and the police to identify the individuals involved.
"The FA want anyone found guilty of throwing missiles to face the strongest possible action. That includes life bans from attending football matches."
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