Celtics president Danny Ainge said Garnett will be out 2-3 weeks with the injury.
"Rest and ice for KG," Ainge told the Globe.
Garnett will stay in Boston for the remaining three games of the Celtics' West Coast trip, Ainge told ESPN NBA analyst Jackie MacMullan.
The Celtics' road trip continues with a game against the Suns in Phoenix on Sunday. Boston returns home next Friday to play Indiana.
Celtics spokesman Jeff Twiss said Garnett was traveling Friday,
and his right knee strain was expected to be examined by Dr. Brian
McKeon on Saturday.
Twiss said Garnett was "not in tremendous pain" on Friday, but
that the knee remained sore and stiff and the Celtics thought it
best to be cautious and have Garnett examined.
Garnett injured his right leg while going up for an alley-oop late in the first half. He landed gingerly and motioned immediately to the bench for a substitute, then hopped on his good foot toward the locker room. The Celtics said he strained his right knee.
He warmed up with his teammates before the second half, but did not return to action.
Garnett released a statement after the game, saying he would have the knee re-examined on Friday.
"We should have more information at that time. Obviously, I would much rather be playing instead of giving this statement," Garnett said.
Information from The Associated Press was used in this report.