Team news
Chelsea's head coach Enzo Maresca says he is yet to decide if keeper Robert Sanchez will start after his mistake led to a goal in the defeat by Manchester City last Saturday.
Benoit Badiashile, Romeo Lavia and Wesley Fofana remain on the sidelines.
West Ham captain Jarrod Bowen could return after a month out with a fractured foot.
Lucas Paqueta faces a fitness test on a groin problem, while Crysencio Summerville is doubtful due to a hamstring injury.
Konstantinos Mavropanos is available again after suspension.
Match facts
Head-to-head
Chelsea have won the past two Premier League meetings by an aggregate score of 8-0 and are aiming to win three top-flight matches in a row against West Ham for the first time since 2011.
The Blues have won 31 Premier League matches against West Ham, second only to their 36 victories against Tottenham.
The Hammers' only victory in their last 18 top-flight fixtures at Stamford Bridge was by 1-0 in November 2019.
Chelsea
Chelsea have followed a run of five straight top-flight victories with one win in their subsequent seven.
Their three defeats in the past six league matches is as many as they had in their previous 32 top-flight fixtures.
Enzo Maresca's side are winless in their last four league away games.
Chelsea have scored the opening goal in five of their past six league matches but have gone on to win only one of those (D2, L2).
The Blues are the only Premier League side not to have given a single minute to a player aged 30 or older this season. Tosin Adarabioyo is the oldest player to feature at 27 years and 118 days.
Robert Sanchez has made five errors leading to a goal in the Premier League this season, the joint-highest figure along with Ipswich's Arijanet Muric. It is already the highest tally by a Chelsea player in a season since such records were kept from 2007-08.
Nicolas Jackson's tally of 11 goals in 14 London derbies is the most of any top-flight player since he joined the Blues at the start of last season.
West Ham United
West Ham have won just two of their past eight league games.
They have conceded nine goals in the opening 10 minutes of matches this season, two more than any other side prior to the latest round of fixtures - and their most ever in a season.
The Hammers have forced 33 high turnovers since Graham Potter's first league game in charge, second only to Manchester City ahead of the current matchround. The Hammers ranked 10th for this metric under Julen Lopetegui.
Potter is aiming to become the first ex-Chelsea manager to return to Stamford Bridge and win a Premier League fixture. The previous eight managers failed to do so in a combined 22 attempts (D8, L14).
Mohammed Kudus has completed a top-flight high of 57 dribbles in the Premier League this season.
Kudus has completed five or more dribbles in 20 Premier League matches since joining West Ham at the start of last season, the most of any player in Europe's five biggest leagues.
