Answer
No, Gojko Kačar was never the captain of the Serbian national team. He was a regular member of the team from 2007 to 2015, earning 27 caps and scoring one goal, but he never held the captain's armband. The captaincy was primarily held by players such as Dejan Stanković, Nemanja Vidić, and Branislav Ivanović during Kačar's time with the national team.