A midfielder, Kozák joined Bratislava in the year 2003, winning the Corgoň Liga with the club the very next season, 2004–05.
He made his debut for Albion on 4 February 2006, coming on as a substitute for Geoff Horsfield in a Premier League match against Blackburn Rovers.
He was not considered good enough for the then manager Bryan Robson to sign, so left at the end of his loan spell.
[citation needed] Kozák has played in Euro 2008 qualifying and 2010 FIFA World Cup qualification.
[2] He subsequently progressed with Slovan into the group stage of Europa League and won the Slovak double.