Chelsea are investigating alleged racist abuse directed at Son Heung-min during Sunday’s 2-2 draw with Tottenham.
The South Korean forward started the London derby and played 79 minutes before being replaced by Yves Bissouma.
The incident is believed to have taken place in the second half when Son went over to take a corner at the Shed End.
Son Heung-min started for Tottenham against Chelsea on Sunday at Stamford Bridge
Chelsea are looking into an incident of possible racist abuse aimed at Son by a supporter
Son has experienced racist abuse before during his time in England.
Back in 2019, a West Ham fan was fined for racially abusing him during a Carabao Cup match.
Two years later, Manchester United suspended three season-ticket holders after they directed racist abuse at Son online.
On the pitch, the match at Stamford Bridge was an enthralling contest, with Chelsea twice going ahead through Kalidou Koulibaly and Reece James, only to be pegged back twice thanks to goals for Pierre-Emile Hojbjerg and Harry Kane.
Son played 79 minutes in the game at Stamford Bridge before being substituted
The match included several controversial moments, with Blues boss Thomas Tuchel claiming that neither Spurs goals should have stood due to incidents in the build-up to both.
Tuchel clashed with opposite number Antonio Conte on the touchline on multiple occasions, and both managers have since been charged for their actions.
The German coach could find himself in more hot water in the near future after being particularly critical of referee Anthony Taylor’s performance following the final whistle, and questioning whether he should be allowed to officiate Chelsea games moving forward.