Banton was waived by the Celtics on Thursday, Adam Himmelsbach of The Boston Globe reports.
The Celtics had previously exercised their team option on Banton's contract, though he was on a non-guaranteed deal and will now have to explore other opportunities. The 26-year-old guard appeared in six regular-season games between the Celtics and Clippers last season, averaging 2.0 points and 1.8 assists in 10.3 minutes per showing.