Mack was a four star recruit according to ESPN and 247Sports. com. The Scout. com and Rivals. com recruiting networks each gave him three stars. Mack received over a dozen scholarship offers from schools including Michigan, Louisville, Indiana, Iowa State, Florida Atlantic, Florida International, Marshall, and Ball State. Mack initially made a (soft) commit to UCLA but decommitted following a coaching change for the Bruins. Mack took an official visit to Louisville on January 17, 2014. Louisville believed Mack had committed to the Cardinals, but he chose USF on signing day.