Blake Griffin suffered a bone bruise in his left knee during Wednesday's intra-squad scrimmage.
Griffin underwent a precautionary MRI that showed no structural damage to the knee.
Griffin was injured while driving to the basket after being fouled by Lou Amundson.
Griffin stayed down on the court for a few moments.
“Blake hurt his knee, but it was nothing bad,” Doc Rivers said before the team practiced on Thursday. “But he tweaked it. It was on the dunk attempt. He said he did it going up. So he’s out.”