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.


Man dies after being hit by car driven by Inter goalkeeper
Dimitrov marks return from pectoral injury with win in Paris
Real Madrid captain Carvajal faces knee surgery setback
Simeone and Baena strike as Atletico beat Betis to extend unbeaten run
Juventus sack coach Tudor after eight-match winless run
