And the Blues could be down another three players for the trip to Vicarage Road.
Speaking in his pre-match press conference, Tuchel said: "For the game tomorrow at Watford, for sure we will be without Chilly, Kova and N'Golo who are all out and then we have some doubts over some other players that we need a bit more time on, to do some examinations on before deciding whether they can be involved.
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