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.


Gauff outruns Pegula to win thriller at WTA Finals
Fermin double gives LaLiga leaders Barca win at Atletico
Manchester United rescue dramatic 4-4 draw with Aston Villa
Norris wins in Brazil as Mercedes take constructors' title
Arwa Ali wins 100m silver for UAE at Dakar Youth Olympics
