Jeff Green's qualifying offer was pulled by the Celtics

ESPN Boston:
If and when Jeff Green returns to the NBA -- and the encouraging news heading into his heart surgery next week is that he likely will -- he will have plenty of choices as to his next employer.

That's because the Boston Celtics, in a move that was not made public, withdrew Green's qualifying offer in mid-December, right around the time he failed his physical and had his one-year, $9 million contract voided. The move means Green is now an unrestricted free agent.

So...there's no guarantee that Jeff Green will be with the Celtics next year!