 Brežančić made his debut for the Serbia national under-21 team in a 4–1 friendly win over the Macedonia U21s on 7 June 2009.He was subsequently a member of the team at the 2009 UEFA Under-21 Championship, but failed to make any appearance at the tournament.Brežančić recorded his second appearance for the under-21 side in a 1–0 home friendly win over Israel U21 on 11 August 2009.