BOSTON --- Derrick Rose almost always says he's going to play, but he didn't say that about Sunday's nationally televised game against the Celtics, which could mean he'll miss his second straight game because of a back injury.

Rose said his back remains stiff and sore after sitting out Friday night's rout in Charlotte. The Bulls had a light practice Saturday at the University of Massachusetts-Boston. He said he would know more Sunday morning.

"When I wake up I can usually tell so I'll probably know by the time I wake up," Rose said.

Rose had missed six games this year with toe and back injuries despite entering the season in the best shape of his career.

"This is the most I've ever been injured," he said. "It's frustrating knowing I worked so hard. I hate missing games, especially when we're playing against great teams. I hate missing any game."