Ballo, a 7-foot, 260-pound center who is from Koulikoro, Mali, has one season of eligibility remaining and recently completed a visit to Bloomington.
He chose the Hoosiers over interest from Arkansas, Louisville, Kansas State, North Carolina, Florida and others. In the latest 247Sports transfer portal rankings, Ballo is considered the No. 1 prospect in the portal.
Ballo averaged 12.9 points, 10.1 rebounds and 1.3 blocked shots in 25.9 minutes per game last season for the Wildcats.
He began his career at Gonzaga and will turn 22 in July.
In 132 career games between Arizona and Gonzaga, Ballo has averaged 9.