[2][3] During his time with Kamen Ingrad, he had an unsuccessful trial session with Swedish-side Umeå FC in the summer of 2007.
[5][6][7] During his tenure with Široki Brijeg he featured in the 2007–08 UEFA Cup against Koper, and Hapoel Tel Aviv[8][9] He made his second continental appearance in the 2008–09 UEFA Cup against Partizani Tirana, and Beşiktaş J.K.[10][11] In 2009, he returned to the Croatian circuit to play with HNK Suhopolje.
[25] Throughout the 2019 campaign, he helped the club in securing a playoff berth by finishing sixth in the league's first division.
[30] Zelenika made his debut for the Croatia national under-19 football team on February 13, 2006 in a friendly match against Hungary.
[32][33] He also played with the Croatia national under-20 football team making his debut on September 26, 2006 in a friendly match against Slovenia.