Chelsea have launched a formal complaint to UEFA over racist chants made towards Callum Hudson-Odoi during their Europa League match away to Dynamo Kyiv.
Maurizio Sarri's men advanced to the quarter-finals of the competition after winning 5-0 at the Olympic Stadium.
English youngster Callum Hudson-Odoi started the game, providing an assist for Marcos Alonso before scoring the final goal himself.
However, the Blues winger was subject to racist abuse and chants from a small portion of the home crowd, which was raised by Chelsea to match officials after the final whistle.
According to the Evening Standard, the abuse included monkey chants during the second half.
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The Blues have now confirmed they have submitted a formal complaint to UEFA, issuing the following statement:
"We can confirm a report of racist abuse directed at one of our players in the final minutes of the match in Kiev from a small section of home supporters.
"We wholeheartedly condemn such abhorrent behaviour.
"The matter was reported to the referee at the final whistle and the chairman and club secretary spoke to the UEFA match delegate immediately after the match.
"We expect UEFA to conduct a fulsome investigation and we will provide full cooperation."