Shaquille O'Neal limped off the court less than six minutes into his first game back in more than two months with a strained right calf. O'Neal had just missed 27 games with a sore right leg.

It's not clear how long this latest injury will sideline O'Neal, but it does cast doubt on his ability to help the team in the playoffs.

The Celtics had been counting on O'Neal to take important minutes at center in the playoffs, especially after trading Kendrick Perkins to Oklahoma City for Nenad Krstic, who is day-to-day with a bone bruise in his right knee.