PORTLAND, Ore. — Trail Blazers center Greg Oden will sit out at least two more games because of a bone chip in his left knee.

Oden was hurt in a collision during a game at Golden State before the All-Star break. It forced him to miss the All-Star rookie challenge and Wednesday night's game against the Memphis Grizzlies.

He will miss home games against the Atlanta Hawks on Friday night and against the Los Angeles Clippers on Sunday. He will be evaluated for the team's three-game road trip next week.

The top pick in the 2007 draft sat out all of last season after microfracture surgery on his right knee. He missed six games at the start of this season with a foot injury.

Oden has averaged nine points and just over seven rebounds in 39 games this season. Joel Przybilla will start in his absence.