Celtics GM Danny Ainge confirmed today that his team will exercise its 2014/15 option on Jared Sullinger‘s rookie contract, according to Chris Forsberg of ESPNBoston.com (via Twitter). However, the C’s will turn down their option on offseason acquisition MarShon Brooks, says Forsberg.

The decision to pick up Sullinger’s third-year option comes as no surprise, following a productive rookie season that was cut short by back surgery. As our rookie contract option tracker shows, he’ll be in line for a 2014/15 salary of only about $1.42MM, so it will have a negligible impact on Boston’s cap flexibility.

As for Brooks, his $2.18MM fourth-year option is fairly inexpensive as well, but it seems the former Net isn’t in the Celtics’ long-term plans at the moment. Although the team will still be able to re-sign Brooks if he impresses in Boston this season, he’ll now be an unrestricted free agent next summer.