West Ham United are without a goal or a win in their last three matches, but are aiming to complete a league double over Chelsea.
The Blues can strengthen their position in the top four with a fourth successive victory, having beaten Aston Villa and Manchester City since the Premier League resumed.
Team news
West Ham trio Sebastien Haller (hip), Angelo Ogbonna and Arthur Masuaku (ankle) have started taking part in training but Wednesday's match may come too soon for them.
Christian Pulisic (calf) and Andreas Christensen (hip) are doubts for Chelsea.
Did you know?
West Ham have lost all three of their home London derbies in the Premier League this season.
The 1-0 win at Stamford Bridge in November means West Ham can complete their first league double over Chelsea since 2002/03, a campaign in which the Hammers were relegated.
Christian Pulisic has scored seven Premier League goals this season for Chelsea, the most of any player in the competition aged 21 or younger.
Chelsea have won their last three Premier League away London derbies. They last had a longer such run between April and November 2009, with four.
Match officials
Referee: Martin Atkinson. Assistants: Lee Betts, Harry Lennard. Fourth official: Graham Scott. Replacement official: Robert Hyde. VAR: Jonathan Moss. Assistant VAR: Eddie Smart.
