Sullinger, 28, has not played since the 2018-19 season, when he was with the Shenzhen Leonards of the Chinese CBA.
He is 6-foot-9 and was drafted by the Boston Celtics with the 21st overall pick in the 2012 draft following a successful career at Ohio State. But back issues have plagued Sullinger for most of his pro career.
Following four years with the Celtics, Sullinger played his most-recent NBA season with the Toronto Raptors in 2016-17.
He carries NBA career averages of 10.8 points and 7.5 rebounds.