The 6-foot-9 Green came to the Celtics at the 2011 trade deadline in the deal which sent Kendrick Perkins to the Oklahoma City Thunder. He averaged 9.8 points and 3.3 rebounds in 26 games with Boston after the deadline day deal.
Green missed the entire 2011-12 season after having heart surgery to repair an aortic aneurysm. Green's agent David Falk told Berget that the way the Celtics handled Green's recovery was "First Class", and was one of the main reasons why Green came back to Boston.
In his 5-year career, Green has averaged 13.9 points and 5.6 rebounds a game since being drafted fifth overall by the then Seattle SuperSonics in 2007.
Terms of the deal have not been released.