The Thunder agreed to a trade with Boston on Monday, sending Rodney Purvis to the Celtics for forward Abdel Nader.
Purvis had just been acquired by the Thunder on Friday from Orlando in a deal which sent Dakari Johnson to the Magic.
In 48 games for Boston, Nader (6-foot-6, 225 pounds) averaged three points and 1.5 rebounds per game as a rookie, including 35.4 percent from 3-point range. Nader was named the G-League Rookie of the Year in 2016-17, averaging 21.3 points, 6.2 rebounds and 3.9 assists for the Maine Red Claws.