King went undrafted out of Middle Tennessee State and spent Summer League playing for the Lakers. Roberson also went undrafted and saw limited action for the Warriors’ summer league squad. Both players are expected to play for the Celtics’ G League team, the Maine Red Claws.
Boston now has 18 players under contract, including its pair of players on two-way deals. The team will need to make one more move before the season begins, as the maximum roster count is 17.