Citing NBA sources, the Boston Globe has reported Celtics forward Leon Powe is expected to undergo surgery on his left knee and will miss the remainder of the postseason. Powe injured his left knee during Game 2 of the Celtics-Bulls series. He left the game in the second quarter and was taken to the hospital for an MRI. Powe had recently rehabbed from a right knee injury, which he suffered in March against the Bulls.

The loss of Powe depletes the Celtics frontcourt. Already playing without Kevin Garnett, Powe was the first option off the bench for Glen Davis. He contributed eight points and eight rebounds in 17 minutes against the Bulls in Game 1. Powe also had proven playoff experience after a breakout performance in Game 2 of the 2008 NBA Finals against the Los Angeles Lakers. He is a free agent after this season.

Update: Doc Rivers told reporters Powe has suffered a torn ACL. From Celtics.com:

“He played 3 minutes with a torn ACL on the floor, says so much about Leon Powe the person. Forget the playoffs and all that stuff. That’s just a tough injury for a kid who’s done everything right. That just makes no sense.”