Reece James and Jorginho return to the side as Thomas Tuchel makes four changes from the Watford win.
With Trevoh Chalobah joining the injured list, Thiago Silva, who came on at half-time during the last game, starts today. Jorginho replaces Saul in midfield and James is preferred to Cesar Azpilicueta at right wing-back to make his 100th Chelsea appearance.
Hakim Ziyech, scorer of the winning goal on Wednesday as a substitute, is preferred to Christian Pulisic in attack. Romelu Lukaku is on the bench again.
Former Chelsea man Kurt Zouma is in the West Ham line-up. They make two changes with Issa Diop and Manuel Lanzini coming in.
Chelsea: Mendy; Christensen, Thiago Silva, Rudiger; James, Jorginho (c), Loftus-Cheek, Alonso; Ziyech, Havertz, Mount
Subs: Kepa, Azpilicueta, Sarr, Barkley, Saul, Hudson-Odoi, Pulisic, Lukaku, Werner
West Ham: Fabianski; Coufal, Dawson, Zouma, Diop, Johnson, Soucek, Rice (c), Lanzini, Bowen, Antonio
Subs: Areola, Fornals, Masuaku, Kral, Vlasic, Noble, Ashby, Benrahma, Yarmolenko
The referee is Andre Marriner.
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