Bail had sat for the second half of the season after being ruled academically ineligible.
In 11 games he averaged 1.5 points and 2.6 rebounds in 9.0 minutes per game.
Bail is the Bruins' second power forward departure in less than a week. On Monday, freshman Kevon Looney declared for the NBA Draft.
Bail was not a likely starter candidate for next season. Jonah Bolden, who sat last season after the NCAA declared him ineligible, is considered the front-runner to assume Looney's role.