PHILADELPHIA — Andrew Bynum's debut with the Philadelphia 76ers is on hold again.

General manager Tony DiLeo said Saturday that Bynum is out indefinitely and there's no timetable set for his first game. The All-Star center was acquired from the Los Angeles Lakers in a four-team trade before the season.

"We don't know when he'll be back," DiLeo said. "Only Andrew's body can answer that question. When he feels better, we can step up the rehab program. We just have to wait to see how he reacts to the rehab."

Bynum had been recovering from a bone bruise on his right knee and the Sixers were hoping he would be cleared to return to basketball activities by Dec. 10. But he injured his left knee while bowling two weeks ago and now his return has been pushed back four times since the beginning of training camp.