The Celtics had two roster decisions get decided the day after the draft.
In what wasn't much of a surprise, center Enes Kanter has opted into his $5 million contract, according to ESPN's Tim Bontemps.
The 10-year veteran finished last season averaging 8.1 points and 7.4 rebounds per game.
Meanwhile, according to ESPN's Adrian Wojnarowski, the Celtics have declined a qualifying offer to guard Brad Wanamaker, which makes him an unrestricted free agent. This was expected after the team selected guard Payton Pritchard out of Oregon No. 26 overall in Wednesday's draft.
This doesn't mean Wanamaker can't return, as he can still sign as an unrestricted free agent.
Still, the biggest roster news with the Celtics remains what will happen with Gordon Hayward.