Lewis disclosed his intentions in an interview with KRIV-TV of Houston.
The Longhorns announced his release a little more than a month ago. He'll have to sit out the season, but he'll have two years of eligibility left. Bulldogs head coach Rodney Terry is a former Longhorns assistant.
Lewis was the Longhorns' third-leading scorer last season, averaging 11.2 points in 21 starts. Texas is now without its top three scorers from last season.