The non-guaranteed contract for Griffin was announced Friday.
The 6-foot-8 Griffin played last preseason with the Miami Heat before going overseas. He is playing for the Mavericks summer league team in Las Vegas and averaged 9.8 points while playing 19.3 minutes in the first four games.
Since two seasons at Campbell University (2010-12), Griffin has played professionally in Puerto Rico, Venezuela and Italy. In 60 games at Campbell, he averaged 14.5 points and 7.8 rebounds.