Bayern Munich striker Ivica Olic has been ruled out for six months after damaging knee ligaments.

GettyImagesIvica Olic: Knee ligament damage

• Hoeness questions Van Gaal

The Croatia international has been struggling with knee problems since the start of the season and suffered another setback over the weekend.

He will now fly to the United States to undergo an operation by renowned surgeon Dr Richard Steadman.

"I'm obviously disappointed," said the Bayern striker. "I was hoping to build on my performance last season."

Olic's injury adds to the woes of coach Louis van Gaal, who is also currently without Arjen Robben, Franck Ribery, captain Mark van Bommel and Miroslav Klose.