Premier League club Chelsea have said they will review video footage following allegations that a supporter directed racist abuse towards Manchester City's Raheem Sterling during their match on Sunday (AEDT).
A video posted online showed Sterling being shouted at by fans as he went to collect the ball for a corner.
No arrests were made but the Metropolitan Police issued a statement saying they would review footage to determine whether any racist abuse took place.
Chelsea, who won the match 2-0, said in a statement: "We are aware of a video circulating online in which it is claimed racial abuse was allegedly directed at a player at Stamford Bridge on Saturday.
"We will review the footage to determine whether any offences have been committed."
Also on Sunday, two fans were arrested in Scotland for allegedly directing racial abuse at Motherwell substitute Christian Mbulu during his side's defeat at Hearts.
"The club abhors racism and all forms of abuse, and the individuals in question will receive indefinite bans from Tynecastle Park," a Hearts statement said.