Celtics point guard Rajon Rondo was a late scratch for Sunday's showdown with the Miami Heat due to a hyperextended right knee suffered in Friday's loss to the Atlanta Hawks.
Rondo attempted to warm up for Sunday's game, but the injury did not improve. The team elected to scratch him and he was headed to New England Baptist Hospital for a precautionary MRI.
He's listed as day to day.
Courtney Lee will start in Rondo's place.
Rondo tweaked the knee against the Hawks, but still played nearly 45 minutes while producing a triple-double in the double-overtime loss.
Even before Rondo was scratched, Doc Rivers had decided to make a switch to his starting lineup, inserting rookie Jared Sullinger in place of slumping Brandon Bass.
With the Celtics losers of six in a row, Rivers thought it was time for a shakeup.
"We're going to start Jared, more just because Jared's playing well," Rivers said. "Honestly, I don't love it because I worry about our bench. Our bench has been off the charts and that may affect them. But we're doing it because he's playing so well."
Rivers wouldn't commit to keeping Sullinger in the starting lineup long term, but admitted it was the right move for right now.
"I just thought our starters needed to shake up the lineup, even though I really am doing it cautiously because I just think at some point our starters will find themselves," Rivers said.