Alter impressing at FK Sarajevo, where he led the club's scoring charts for four seasons, Repčić, together with Radomir Savić, made a transfer to Red Star Belgrade in the summer of 1979. In his first season in Belgrade (1979–80), he scored 7 league goals in 33 appearances.
He also had a memorable showing in that season's UEFA Cup round-of-16 second leg match versus Bayern Munich. Red Star was 2–0 down after the first leg in Munich, but led 3–0 in the 50th minute of the return leg at Marakana courtesy of Repčić double and another goal by "Pižon" Petrović.