Willian returns from injury to take his place in the front three with Eden Hazard and Pedro. January signings Emerson Palmieri and Olivier Giroud are named on the bench for the first time.
David Luiz starts his first Premier League of 2018 as he comes in for the injured Andreas Christensen.
Watford XI: Karnezis; Mariappa, Prodl, Holebas; Janmaat, Capoue, Doucoure, Zeegelaar; Deulofeu, Deeney (c), Richarlison.
Subs: Bachmann, Ndong, Pereyra, Lukebakio, Gray, Mukena, Carrillo.
Chelsea XI: Courtois; Azpilicueta, David Luiz, Cahill (c); Moses, Kante, Bakayoko, Zappacosta; Willian, Hazard, Pedro.
Subs: Caballero, Rudiger, Emerson, Drinkwater, Fabregas, Hudson-Odoi, Giroud.
Come on CHELSEA!!!