The Portland Trail Blazers say former No. 1 draft pick Greg Oden will undergo a procedure to ''remove debris'' from his right knee.
The often-injured 7-foot center had microfracture surgery on the knee in 2007, which caused him to delay his rookie season.
Since then, Oden has appeared in just 82 career games for the Blazers, averaging 9.4 points and 7.3 rebounds.
Last season, he had microfracture surgery on his left knee. It was expected that he might be able to play for the Blazers this season, but a checkup before the start of training camp in December revealed he had suffered a setback in his rehabilitation.
Oden hasn't appeared in a game for the Blazers in two years. He will become an unrestricted free agent following this season.