Everton midfielder Darron Gibson is likely to require surgery at the end of the season to fix a persistent thigh problem.
The 25-year-old was sidelined for nearly three months from September and also missed most of January with the injury.
He has recently returned to the Toffees starting line-up, and scored his second goal for the club in Saturday's 2-0 win over QPR, but remains hampered.
"After the game on Saturday, I was asked about Darron Gibson's goal and his shot - I think he could do it more and with more ferocity as well because he's got a great shot on him," said Everton manager David Moyes.
"He has got a bit of a problem at the top of his thigh which will probably require an operation at the end of the season."
Moyes is keen to have Gibson fully fit after being impressed with what he has brought to the Everton midfield.
"What he has given us is that he is good on the ball and he has a better range of passing than maybe some of the other midfielders we have," added Moyes.
"I think overall he has had an impact. He had a bit of a dip midway through after he came back from his injury but his form is good right now."