Perkins suffered a strained right knee -- the same knee he battled tendinitis in late in the season -- during the morning shootaround before Monday's Game 2 triumph over the Cleveland Cavaliers, while Garnett suffered a strained right midfoot in the fourth quarter of that same game.
Garnett showed up at the practice facility Wednesday but wasn't able to fully participate, so coach Doc Rivers told him to rest his foot. He did not address reporters.
Perkins said he expects to return to practice Thursday, while Rivers indicated it was unlikely Garnett would practice then. Both are expected to play in Friday's Game 3 with Perkins going so far as to suggest both could be back on the floor Thursday.
"I'll be ready [for Game 3], I'm going to play," said Perkins. "I'm glad we have a few days of rest, hopefully I can practice tomorrow."
Perkins said he must have simply been "clumsy" when he endured the injury while running down the floor Monday. He said it tightened up on him after Game 2, particularly in the area behind his right knee. Rivers dubbed it a hyperextension.
Garnett spilled to the floor on a fourth-quarter collision with LeBron James as Cleveland's forward drove to the basket. Garnett got up slow, but it's unclear if that's the play he injured himself on.
Perkins suggested Garnett would be ready to go.
"KG wanted to practice today," said Perkins. "He was mad that Doc made him sit out... He'll play on Friday."
Rivers sounded much more concerned than Perkins while detailing the maladies.
"Kevin hurt his ankle pretty good," said Rivers. "Honestly, if we had a game [today], I don't think he could have played. We just have to wait, but I doubt he'll practice tomorrow.
"Perk, we think will be alright. I don't know if he can practice tomorrow, either. We'll just see on Friday."
Celtics president of basketball operations Danny Ainge seemed to indicate Wednesday that neither Garnett nor Perkins were in jeopardy of missing Game 3.
"We should be 100 percent by Friday night, but I think the little bit of a layoff should help," Ainge said during an interview on Boston sports radio station WEEI. "KG, he twisted his ankle, Perk rolled over on it a little bit, he's got a little bit of a sprain on his mid-foot. He should be ready to go. And Perk, at shootaround the other day tweaked his knee a little bit. He's a little bit sore. He should practice tomorrow and both of them will be ready by Friday."