Chelsea head coach Thomas Tuchel will provide an update on the fitness of his players on Friday.
Thiago Silva, Tammy Abraham and Jorginho are all nearing a return, while N'Golo Kante and Callum Hudson-Odoi returned early from international duty because of injuries.
West Brom loanee Conor Gallagher is ineligible to face his parent club.
Hal Robson-Kanu will be in the squad despite being sent home from Wales duty for a breach of coronavirus protocols.
Chelsea have not conceded in any of their past seven matches in all competitions, while West Brom have scored twice in the same number of games.