A. Sherrod Blakely of Comcast SportsNet first reported the news via Twitter:
Barbosa had played only sparingly this season in his first year with the Celtics. While he appeared in 41 games, he only started two of them and had a career low of 12.5 minutes per contest.
His averages of 5.2 points and 1.4 assists per game were also career lows.
However, the guard had taken on a bigger role in recent weeks after Rajon Rondo also went down with a torn ACL. Since that point, Barbosa had become a primary ball-handler and had been a major reason for the team's overall success.
Before Monday's matchup against the Charlotte Bobcats, the veteran was averaging 22.5 minutes per game in the last seven contests, all of which were wins.
While he did not put up huge statistics in that time, his steady play helped Boston end a five-game losing streak and move into seventh place in the Eastern Conference.
With Barbosa now out for the year, it puts a lot more pressure on Avery Bradley as the only true point guard on the roster. The third-year player has done well since returning from an injury of his own, but he is not much of passer and is only averaging 1.5 assists per game.
Considering the team is also without forward Jared Sullinger for the remainder of the season, it could lead to general manager Danny Ainge looking for external options to add depth to the roster.