Duncan (knee) has been ruled out for Tuesday's matchup with the Heat, Tim Reynolds of the Associated Press reports.

EDGE Analysis

Duncan was initially considered questionable, but it's unlikely that he ever had much of a chance to take the floor, as Tuesday will now mark his ninth consecutive absence. San Antonio plays in Orlando on a back-to-back Wednesday night, and it would be a surprise if Duncan is active with the extended All-Star break to follow. In the veteran's absence Tuesday, expect David West and Boris Diaw to see some extra run.