Prior to signing with Željezničar, Pelak was one of the most popular players for Sarajevo, earning the praise of the press as well supporters for his high work rate and leadership ability.
Many players from that generation such as Alen Škoro, Džemal Berberović, Damir Mirvić went on to have relatively successful careers in Europe.
Pelak himself also made several tries, albeit unsuccessful at playing abroad, going to Cerezo Osaka of Japan in 2002 and Dinamo Zagreb of neighboring Croatia in 2003.
On 4 April 2009, Pelak ended his contract with Željezničar and joined Olimpik, playing in the Bosnian Premier League.
He made his debut for Bosnia and Herzegovina in an August 2002 friendly match against Serbia and Montenegro and has earned a total of 2 caps, scoring no goals.