Coach Doc Rivers said nothing is wrong with Garnett, but that he looked sluggish in Boston's 106-96 loss to Washington on Friday night. Garnett was 3 of 12 from the field in 25 minutes, finishing with eight points with four rebounds.
"I thought he looked tired [Friday], so we're sitting him," said Rivers before Boston's 105-90 defeat of Milwaukee. "Obviously, we need him. But we'll only go as far as he's healthy and he's rested. So that's what we're going to do."
That performance was below his season averages of 14.4 points and 7.3 rebounds.
Rivers says they need Garnett, but it's important to make sure he's ready for the postseason and healthy.
Garnett didn't take the decision to sit very well at first, but Rivers says Garnett was doing his part in the Boston locker room by getting a massage before the game.
Information from ESPNBoston.com's Chris Forsberg and The Associated Press contributed to this report.