Boston Celtics center Kendrick Perkins watched Saturday's practice from the sideline after his problematic right knee acted up before the session but is expected to be ready for Game 1 of the Eastern Conference finals against the Orlando Magic on Sunday.
"His knee is bothering him," Rivers said. "He tried to go early, but it started bothering him a lot. He wanted to go, but I told him, 'Look, I don't need you tonight, you're not going to help me today in practice. I need you tomorrow.' So I shut him down."