Barbosa injured the knee in Monday night's game against the Charlotte Bobcats. An MRI on Tuesday revealed the injury. Surgery had not yet been scheduled.
Barbosa has averaged 5.2 points and just over one rebound and one assist in 41 games for the Celtics.
Barbosa is the third Celtics player in two weeks to have a season-ending injury. All-Star point guard Rajon Rondo is out with a torn ACL, and first-round draft choice Jared Sullinger had surgery on his back.
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