Standing at 6 ft 8 in (2.03 m) and weighing 187 pounds (85 kg), he plays both small forward and shooting guard positions.
[1][2] On 25 August 2020, Gušić officially signed his first professional contract with Crvena zvezda.
[4][2] On the same day, he made his ABA League debut in their season opening 97–61 win over Split, making 2 points, 2 rebounds, an assist, and 2 steals in under 16 minutes of playing time.
[5][6] On 7 October, he made his EuroLeague debut in a 75–63 win over Maccabi Tel Aviv, recording only seven seconds of playing time.
[8] His grand-father was Novica Gušić, a colonel in the Army of Republika Srpska.