Career
As of autumn 2015, Ćosić spent his entire career, both youth and senior at NK Inter Zaprešić. A former youth international, he made his first-team and Prva HNL debut in the 23.7.2011. 2-0 away loss to GNK Dinamo Zagreb, coming in the 77th minute for Stjepan Babić.
Nevertheless, he continued on playing for the U-19 team, featuring only sporadically, until the club"s relegation to the Druga HNL in the summer of 2013 when the young center-back became a first-team regular.
