Celtics center Shaquille O'Neal sat out his second straight practice on Monday because of a bruised right knee.

"I doubt if he plays, but we'll see," coach Doc Rivers said of the elder O'Neal playing against Detroit on Tuesday night.

Meanwhile, Jermaine O'Neal is expected to face the Pistons after missing Friday's game against the Knicks with a sore left knee. He should start in Shaquille's place.

"He had a good practice and he'll play," Rivers said. "Obviously, it could swell or something. But right now, he looked good."