Everton striker Aroune Kone will be out of action for some time after tests showed he has a cartilage problem in his knee.
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The Ivory Coast international picked up the knock during Everton's 2-1 Premier League win over Hull City on Oct. 19 and the injury is worse than first feared.
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"We had disappointing news, (Kone) will need a bit of a period away," Everton manager Roberto Martinez told evertontv on Wednesday.
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"We need to give him a lot of support because he was enjoying his role when he came on against Hull and then he got a nasty incident that is going to keep him away for a long time.
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"He had a loosened body, a bit of cartilage in his knee, so we need to repair that which will take time."
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Kone played under Martinez at Wigan Athletic and in June became the Spaniard's first signing as Everton manager. He has made five appearances as a substitute in the league this season and has yet to score.