Andrew Bynum, who was expected to practice for the first time with the 76ers on Wednesday, did not take part in today's workout at the Philadelphia College of Osteopathic Medicine.
Bynum sat out with right knee discomfort.
"Andrew is out until he is pain-free," 76ers general manager Tony DiLeo said after today's practice.
Bynum said the key is not to come back too soon and have an even greater setback.
"I think it's good to be cautious and not to upset the knee and let it fully heal than trying to get out too soon," Bynun said.
Bynum said he doesn't have pain when he walks, but does when he does strenuous activity.
Nobody would say if he would be able to play in the Sixers opener, Oct. 31 at the Wells Fargo Center against the Denver Nuggets.
Yet if he's still having pain and needs rest, it would be very surprising if Bynum is in the opening night lineup.
The other Sixers who did not practice were Kwame Brown (left calf strain), Maalik Wayns (head contusion) and Evan Turner (left ankle sprain). Those three players are listed as day to day.