The 6-foot-9, 220-pound Rabb is from Oakland, Calif., and plays for the Oakland Soldiers. He was playing in the Las Vegas Classic this week and has been tracked by the U of L coaches, including Pitino who watched him on Thursday.
Rabb mentioned on Thursday that U of L was one of the schools that hadn't offered him that he was interested in learning more about. Now, the Cardinals have joined the list of offers.
"Coach Pitino is a great coach and they have one of the best programs in the country," Rabb said.
Rabb is ranked as the No. 3 player nationally i the class by Scout.com. Among the other schools with offers out to Rabb: Arizona, UCLA, USC, California, Connecticut, Arizona State, Kansas, Ohio State, Stanford, UNLV and N.C. State.
Rabb has helped the Oakland Soldiers to a 3-0 record heading into Saturday's tournament play at the Las Vegas Classic.
U of L assistant coach Wyking Jones has been recruiting Babb for a few months.
The offer is at least the 15th one out for players in the Class of 2015 by U of L.