With starters Kendrick Perkins and Rajon Rondo both unable to finish Game 4, and Paul Pierce also injured, the Celtics will be relying on their reserves when they try to close out the Los Angeles Lakers in Game 5 on Sunday night.
"We're not in great physical shape, there's no doubt about that," coach Doc Rivers said Friday, when he gave his players a day off to celebrate their rally from a 24-point deficit to beat the Lakers 97-91 and move within one victory of the NBA title.
"I think our guys are mostly gamers," Rivers said at the Lakers' practice facility. "It's amazing going through this. That's part of it. It's a lot of physical and mental things that you have to go through, and we're going through it."
Perkins left the game on Thursday night, clutching his left shoulder after slamming into Lakers forward Lamar Odom early in the third quarter. The Celtics said Perkins had a strained left shoulder, and he didn't return to the game.
Rivers said Friday that Perkins has a 50-50 chance "at best" of playing in Game 5 on Sunday night.
"When I first saw it, I didn't like what I saw," Rivers said. "Obviously the injury he had last night could be significant, and we don't know the results yet. But that's clearly not looking great right now."
Rondo bruised a bone in his left ankle in Game 3 and didn't practice before the fourth game. He started Thursday, but played only 17 minutes before going to the bench for good with 7:06 left in the third quarter.
"The fact that Rajon tried to go last night, again, was phenomenal," Rivers said.
But the fact that he finished with only five points and two assists meant that Rivers had to rely upon Eddie House, who as the third-stringer behind Rondo and Sam Cassell had played minimal minutes since Game 2 of the Eastern Conference finals.
House played 25 minutes on Thursday night - his most in more than two months
- and his 11 points included a pair of 3-pointers and some key baskets as the Celtics staged the biggest NBA finals comeback since the league began keeping such records in 1971.