Jackson, 26, is 6-foot-8 and was the No. 15 overall pick by the Kings in the 2017 NBA Draft. He spent most of last season with the Thunder, appearing in 34 games and averaging 7.2 points.
He also played one game with the Bucks last season, and was waived by the Mavericks before the start of this one in training camp. He has been playing for the Texas Legends of the G League.
“Boston has a handful of players in the league’s health and safety protocols — Sam Hauser, Juan Hernangomez, Al Horford, Jabari Parker and Grant Williams,” noted Dana Gauruder of Hoops Rumors. “The exemption is being used by multiple clubs to handle the current COVID crisis around the league. Players signed via the exemption don’t count against the 15-man roster limit.”