"[Team physician] Dr. [Brian] McKeon came to me about an hour [before practice] and said, 'We're not even going to put him on the floor; we're not even going to try,'" said Rivers.
The team tried to put O'Neal through a simulated pregame workout Saturday, but he experienced immediate soreness before being ruled out for Game 1. While there's no exact timeline for O'Neal's return, Rivers wouldn't go so far as to rule him out for the duration of the first-round series.
"The only assumption I'm going on is the one that he's not playing in Game 2," said Rivers. "He's got a different brace now and we've got two [off days] after [Game 2] that he can practice, hopefully. If he doesn't practice, at least if he could do something on the floor with us, then we can make that evaluation."
Chris Forsberg covers the Celtics for ESPNBoston.com.