Dan Hamilton-USA TODAY Sports

Free agent addition Tristan Thompson will be sidelined for most of Celtics‘ training camp due to a strained hamstring, tweets Tim Bontemps of ESPN. Coach Brad Stevens is still optimistic that Thompson can be ready for the regular season opener December 23 against the Bucks.

The Celtics signed Thompson to a two-year, $19M contract to help bolster their frontline. They revealed earlier this week that he suffered a minor injury to his hamstring during an offseason workout.

Thompson, 29, spent the first nine seasons of his career in Cleveland, where he made four trips to the NBA Finals. He became a free agent after averaging a career-best 12.0 points per game last season.

This article first appeared on Hoops Rumors and was syndicated with permission.

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