Everton manager David Moyes says it is a “big blow” that on-loan midfielder Jack Grealish has a stress fracture in his foot.
Moyes said he could not give a timescale for Grealish’s recovery.
The 30-year-old, who is on a season-long loan from Manchester City, has made 22 appearances in all competitions for Everton this season.
He has scored two goals and provided six assists.
Grealish played the full 90 minutes as Everton beat former club Aston Villa 1-0 in the Premier League on Sunday.
More to follow.