Everton midfielder Abdoulaye Doucoure has sustained a foot injury but will not require surgery, the club has said.
The Frenchman, 28, suffered a “stress response in a bone in his foot” during Sunday’s 1-0 home loss to West Ham in the Premier League.
Everton’s medical team is currently assessing the extent of the injury.
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Rafael Benitez’s side are already without injured midfielders Andre Gomes and Fabian Delph, plus forwards Dominic Calvert-Lewin and Richarlison.
Doucoure, who was out injured for several weeks earlier this year with a small fracture in his foot, has been in excellent form for the Toffees this season and has supplied the joint-second most assists in the Premier League.
Everton are due to host Watford in the league on Saturday at 15:00