Celtics forward Paul Pierce had fluid drained from his right knee Wednesday and will miss the next two weeks.
Pierce did not make the flight to Orlando, Fla., for a Christmas Day game against the Magic, one day after Kevin Garnett missed his first game of the season with a thigh bruise.
The Celtics are on a six-day, four-game trip that includes games against the Clippers, Warriors and Suns before they return home for a Jan. 2 game against the Raptors.
Pierce could be back for a Jan. 6 game at Miami.
The 2008 NBA Finals MVP had played in every game this season, leading the team with an average of 18.2 points.
•Bobcats center Tyson Chandler has a stress reaction in his left foot and will be out at least a week. He was injured in the second half Tuesday against the Pistons. ... Pau Gasol agreed to a three-year contract extension with the Lakers through the 2013-14 season that could be worth more than $60 million depending on future salary caps. ... Clippers forward Blake Griffin has been cleared for tougher workouts on his broken left kneecap - including running on an anti-gravity treadmill - moving the No. 1 draft pick closer to his NBA debut.