In the heart of defence, Andreas Christensen comes in for Thiago Silva, and Cesar Azpilicueta replaces the injured Reece James at right wing-back.

Saul starts his first Premier League game since his Blues debut on 11 September, and there is an all-new attack with Mason Mount and Christian Pulisic flanking Kai Havertz.

The bench includes Romelu Lukaku as well as injury doubts Jorginho and Timo Werner.

Chelsea (expected 3-4-3): Mendy; Chalobah, Christensen, Rudiger; Azpilicueta (c), Loftus-Cheek, Saul, Alonso; Mount, Havertz, Pulisic

Substitutes: Kepa, Sarr, Thiago Silva, Barkley, Jorginho, Hudson-Odoi, Ziyech, Lukaku, Werner

Watford (expected 4-1-4-1): Bachmann; Femenia, Cathcart, Troost-Ekong, Masina; Louza; Joao Pedro, Cleverley, Sissoko (c), King; Dennis

Substitutes: Elliot, Ngakia, Rose, Hernandez, Gosling, Fletcher, Tufan, Kabasele, Kucka

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