Chelsea have several doubtful players for today. David Luiz could miss today due to a knee injury, Van Ginkel and Zouma are both having fitness issues, while Oscar is ill, Pedro's ankle is injured and Matic is struggling due to a calf injury.
West Brom are having more luck, as just two of their players are having match fitness problems (McAuley, Morisson).
Here are the probable line-ups:
Chelsea: Courtois, Azpilicueta, David Luiz, Cahill, Moses, Kante, Matic, Alonso, Willian, Costa, Hazard.
West Brom: Foster, Evans, McAuley, Nyom, Dawson, Yacob, Fletcher, Phillips, Chadli, Brunt. Rondon.