Everton boss Roberto Martinez fears Kevin Mirallas could be out of action for a little while.
The 26-year old Belgian winger required a stretcher to leave the Anfield pitch during the first half of Saturday's 1-1 draw with Liverpool.
Mirallas suffered a hamstring injury in the Merseyside derby and Martinez admits it could be a few weeks before he returns to the Toffees line-up.
"It seems bad. It's a hamstring. We're going to assess him in the next 24 hours," said the Spaniard.
"Kevin has been in great form and we've got a lot of games coming up. It's very unfortunate for us."
