Everton manager Roberto Martinez is waiting to learn the extent of a toe injury suffered by Ross Barkley amid fears the midfielder could be out for several weeks.
Barkley missed Everton's 2-0 win over Norwich City on Saturday after picking up a similar injury to the one which kept team-mate Leighton Baines for over a month earlier this season.
The England international will undergo scans on the problem and Martinez is concerned about how long Barkley could be missing for.
"We are a little bit worried," said Martinez. "We are going to assess him.
"It's a very similar incident to the one that Leighton Baines had. Before we say exactly what it is there will be more scans, but it could be a fracture in his toe.
"Knowing Ross, he is a young man, hopefully he is going to accelerate the (recovery) process."