Southampton are expected to be without striker Shane Long, who could miss the whole Christmas fixture schedule due to a knee injury sustained in last week's win at Aston Villa.

Winger Moussa Djenepo (hamstring) and defender Yan Valery (infection) remain unavailable, but midfielder Pierre Hojbjerg has recovered after taking a bang on the knee at Villa and is expected to be fit.

Sofiane Boufal could return to contention after struggling with a toe injury sustained when he accidentally ran into his kitchen table at home last month and Kevin Danso has recovered from illness.

Chelsea provisional squad: Arrizabalaga, Zouma, Christensen, Rudiger, Tomori, Emerson, James, Azpilicueta, Alonso, Kovacic, Jorginho, Willian, Kante, Pulisic, Abraham, Hudson-Odoi, Mount, Batshuayi, Caballero, Gilmour, Barkley, Pedro, Giroud.

Southampton provisional squad: McCarthy, Stephens, Soares, Bertrand, Bednarek, Redmond, Ward-Prowse, Armstrong, Hojbjerg, Ings, Adams, Obafemi, Romeu, Boufal, Gunn, Vestergaard, Yoshida, Danso.