Perkins' status for Thursday's game against Denver is uncertain, but he deemed himself likely to play.
Perkins bumped the knee while trying to spring teammate Ray Allen with a screen. Curry tried to get around the Boston big man as he jutted out his left leg to detour the chasing defender. Their knees bumped and Perkins immediately grabbed at the knee in pain.
He stayed on the court for another 20 seconds before a stoppage in play following a Boston basket.
Fortunately for Perkins, it's not the same knee that underwent ACL surgery this offseason. But the Celtics were clearly exercising caution and, not wanting to put too much stress on either knee, Boston kept Perkins out the remainder of the game.
"Don't know," Rivers told reporters when asked about the injury. "[Team trainer] Eddie [Lacerte] thought it was a bruise and that's what we're hoping it is. I didn't see it, [so] we'll just wait and see."
Perkins sported a large wrap over his left knee for a while in the second half, but stayed on the bench and could be seen moving around during timeouts.
"It just didn't feel right and Doc told me, 'Don't try to be a hero,'" Perkins told reporters. "At the same time, I wanted to go back out there. I started to feel good, but at the end of the day it's just a minor setback."
Perkins said his left knee was strained and would be reevaluated Wednesday.
Already playing without Shaquille O'Neal (inflamed right Achilles) and Jermaine O'Neal (left knee surgery), the Celtics can ill afford another injury up front. Rookie center Semih Erden, who sat out extended time before the break while nursing a right adductor strain, logged 17:10 Tuesday and mustered little in the way of production (zero points, one rebound, four assists) as he catches up a bit after returning home to Turkey last week.
Chris Forsberg covers the Celtics for ESPNBoston.com.