The diagnosis was made by Dr. Steven Flores following an MRI, Stone said.
According to sources, Wall's injury is a Grade 2 hamstring strain, which has a typical recovery time of approximately three weeks. With the Rockets eliminated from playoff contention, the team has no intention of rushing Wall back.
Wall averaged 20.6 points and 6.9 assists while shooting 40.4% from the floor in 40 games this season for the Rockets, who have the NBA's worst record at 15-46 in the first year of a rebuilding project on the heels of trading longtime franchise cornerstone James Harden.
Wall, a five-time All-Star, had missed the previous season and a half due to heel and Achilles tendon injuries. Wall missed several games this season due to swelling in his left knee, an issue that sources said could require offseason arthroscopic surgery.
Wall, 30, is owed $91.7 million on his maximum contract over the next two seasons.