Johnson signed an Exhibit 10 contract with the Hawks on Monday, Brad Rowland of the Locked On Podcast Network reports.
Johnson is set to join Atlanta for training camp, though the Hawks could waive him at any time since they own his G League rights. Over 32 appearances for the G League's College Park Skyhawks last season, he averaged 14.5 points, 6.6 rebounds, 2.9 assists, 1.6 steals and 0.6 blocks across 30.6 minutes per tilt.