Manchester forward Raheem Sterling this evening.
The Metropolitan Police also said it was "aware of a video circulating online in which it is claimed". In a statement, the force said: "We will review the footage to determine whether any offenses have been committed."
A clip of a Chelsea fan abusing Sterling as he went to pick up the ball circulated on social media during the match, which Chelsea won 2-0. He was identified by stewards who spoke to him at the end of the match.
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Will be investigated using television footage and CCTV to find out what he said to Sterling. If he was found to be racially abusive, then he will be banned by the club.
Rio Ferdinand, who watched the game at Stamford Bridge while working as a pundit for BT Sport, tweeted alongside the clip: "Are we going to keep this type of racist behavior going on ??? All for kicking a ball! "
Ian Wright tweeted: "The bad old days are back! Chelsea you have been shamed by this disgusting racist fan! absolutely no doubt about what he says. "
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