Everton are hopeful that Steven Pienaar's injury is not as bad as first feared.
The South African has been on crutches since hurting his knee against Portsmouth at the weekend.
The club have been assessing Pienaar's fitness over the last few days and head physio Mick Rathbone is hopeful the injury is not too serious.
"There's no timescale at the moment but hopefully it will only be something short term," he told Everton's official website.
"Steven took an almighty knock on the inside of the knee, so he is pretty sore.
"Me and the doctor had a good look at him after we flew back from the game at Portsmouth. Then we had another good look at him yesterday and again today. It has slightly improved but it is still very, very sore to touch.
"There's a lot of bruising and a lot of swelling around the area, so we've got him on crutches at the moment.
"It looks like it is just bruised but I am hesitating because it is so hard to examine the knee. We have looked at the film to see what happened and how it is today and we are pretty confident it is okay. But it is badly bruised and it's pretty sore, as you can imagine."