Everything you need to know ahead of Monday's Premier League match at the London Stadium as the Blues travel to face the Hammers.
Antonio Conte will face off against his friend Slaven Bilic for the third time this season in Monday night's match at the London Stadium - with both managers having each notched a 2-1 win against each other this season.
Chelsea won the league match between the two teams on the opening day of the season as Diego Costa's last minute winner made it 2-1 at Stamford Bridge. West Ham knocked Conte's side out of the EFL Cup with a 2-1 win in October - which came during the Blues' 13 match-winning run in the Premier League.