Matt Costello, of Michigan State, has agreed to a contract with the Hawks and will go to the Las Vegas Summer League and training camp with the team.
Costello, a 6-foot-9, 245-pound forward, was not selected in Thursday’s NBA Draft.
Costello played four seasons at Michigan State. He was third-team All-Big Ten as a senior last season. He averaged 10.7 points, 8.2 rebounds and 22.9 minutes in 35 games.