Watford midfielder Peter Etebo is expected to be out for between four and five months because of a leg injury.
Etebo, 25, tore a quad muscle in the Hornets' 1-1 draw against Newcastle, and the club announced on Thursday that he would not return until the new year.
The Nigeria international, who is on loan from Stoke, is therefore set to miss the Africa Cup of Nations in Cameroon, which begins on 9 January.
Watford, who are 12th in the Premier League, visit Leeds on Saturday.
The club say midfielder Tom Cleverley and goalkeeper Daniel Bachmann should both be available again.