Everton boss Ronald Koeman has revealed Yannick Bolasie is set to undergo surgery on his knee for a second time.

The former Crystal Palace winger suffered anterior cruciate ligament damage during the 1-1 draw against Manchester United in December 2016 and is expected to be out of action for the remainder of the calendar year.

He previously underwent surgery on his meniscus and is due for a second operation early next month.

"Yannick has his second surgery in early March," Koeman said at a news conference.

"The surgery was expected because his first surgery was about his meniscus, now what will happen at the beginning of March is about his cruciate.

"It is difficult to put a timescale because normally a cruciate can be six, seven, eight months.

"We had to repair the meniscus and then wait until his knee was ready to have the second operation.

"He was in several times during the week. He was OK, really positive, working hard to come back, but like every player in that situation you get difficult moments in a day, difficult moments in the week.

"He is positive about coming back as strong as possible."