Chelsea registered a 2-0 victory over their London rivals Tottenham in the Premier League but the win was overshadowed by allegations of racist abuse.
It's after Chelsea defender Antonio Rudiger reported he had been subjected to discriminatory chanting by fans.
Brazilian forward Willian scored both goals before Spurs striker Son Heung-Min was shown a straight red card for violent conduct.
Elsewhere, Watford beat Manchester United 2-0 to win their first game under new manager Nigel Pearson.


UAE's Ben Sulayem secures second term as FIA president
Liverpool boss Slot to meet Salah amid tension
Abu Dhabi achieves record 339,000 visitors at Grand Prix
New Zealand romp to victory over West Indies in second test
