Andre Drummond was limited to four minutes on Wednesday due to back pain.
Drummond played late in the first quarter and early in the second quarter and was clearly in discomfort.
"After I took that charge, it just hit me again," he said.
Drummond sat the rest of the game with his lower-left back strain near his tailbone, and the pain was evident on his face as he left.
"My back has been terrible," Drummond said.
Drummond initially suffered the injury on Sunday and was limited to eight minutes in Monday's game at the Knicks.
"We thought he was good enough to go, he thought he was good enough to go, and then once you've seen him on the court, you see him labor out there," Lawrence Frank said.