Mackinnon signed a two-year deal with the NBL's Brisbane Bullets on July 27, according to Olgun Uluc of ESPN.
Mackinnon was previously on an Exhibit 10 contract with the Hornets, whom he joined for the Las Vegas Summer League. In 31 outings at LSU last year, he averaged 15.7 points, 2.6 rebounds, 2.5 assists, 0.3 blocks and 0.5 steals across 31.9 minutes per contest.