He made his debut for Austria Wien in Europa League match against SV Werder Bremen, playing 90 minutes in eventual 2-0 loss.

He made four appearances in 2013–2014 Champions League Group G. In January 2014 Leovac signed with Croatian Prva HNL team HNK Rijeka, for a reported fee of €250,000.

In his first half season with Rijeka he made 11 appearances in Prva HNL and helped the team win Croatian Cup.

Lucescu has inserted Vieirinha in the left-back role in place of Leovac and Dorian Lévêque, but PAOK understand their need to strengthen this area of the pitch if they're to have any chance of claiming an historic league title.

[9] On 6 February 2018, PAOK reached an agreement with Leovac's ex-club HNK Rijeka on a six months loan until the end of the season, with a €1.3 million purchase option.

[12][13] In November 2014, after a string of good performances for HNK Rijeka, Leovac was called up for the Croatia national team friendly match against Argentina.

On 27 October 2016, Leovac was called up in his motherland's national squad, after more than 13 months, ahead of the upcoming World Cup qualifier against Iceland.