 Kuzmanović made his Internazionale debut on 3 February 2013, where he made his first start and provided the only goal in the game for Internazionale, as they lost 3–1 to AS Siena.Kuzmanović went on to establish himself in the first team, making thirteen appearances for the club.However, in the 2013–14 season, under the new management of Walter Mazzarri, Kuzmanović was deployed only sparingly and spent most of the season on the substitute bench.