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Everton's Yannick Bolasie damaged his right knee in a challenge with Manchester United's Anthony Martial

Everton winger Yannick Bolasie could be out for a year with a knee injury, says manager Ronald Koeman.

Bolasie, 27, injured his right knee during the Toffees' 1-1 draw with Manchester United on 4 December.

Manager Koeman said on Wednesday: "It will be around 11-12 months before he is back. That is a big disappointment but he will come back."

Bolasie is due to have a second operation - on his anterior cruciate ligament - in the coming weeks.

The DR Congo international signed for Everton from Crystal Palace in a £25m deal in August, and had played in every league game this campaign up until his injury.