The Lakers announced the move Wednesday.
Nwaba earned a job with the Lakers after they called him up from their D-League affiliate on Feb. 28. The rookie averaged 6.0 points and 3.2 rebounds per game while impressing Luke Walton's coaching staff with his hustle and defensive play.
The Lakers signed him to a new contract with a multi-year component just three weeks after his NBA debut.
Nwaba is a local product, attending University High School in West Los Angeles and Santa Monica College before finishing his college career at Cal Poly.