Everton’s on-loan Barcelona winger Gerard Deulofeu has suffered a hamstring injury and is likely to be out for several weeks.
The Spaniard was stretchered off in Everton’s 4-1 win over Fulham on Saturday and is set to have a scan.
Manager Roberto Martinez said: “Gerard's injury is a negative. He's a sprinter and he's pulled his hamstring.
"We don't know how big the tear is but we expect him to be out for a little bit of time. It is unfortunate because I thought he was ready to play a big role in the side.
"We have to be patient to get him ready for an important final third of the season."
Deulofeu, who was making just his second Premier League start, had scored Everton’s equaliser against Arsenal at the Emirates Stadium six days earlier.
His departure was another injury blow for Everton, who were already without Leighton Baines, Arouna Kone and Darron Gibson.
Martinez admitted his side weren’t at their best as they defeated Fulham with goals from Leon Osman, Seamus Coleman, Gareth Barry and Kevin Mirallas.
But he was delighted with the response they produced when Dimitar Berbatov equalised for Rene Meulensteen’s side.
He added: "It wasn't one of our best days. It probably wasn't a 4-1 performance but we deserved the three points and to be able to react to the penalty in that manner is really pleasing.
"We got four goals which is pleasing because in other games we've had more chances and not been able to convert them.”