Best known for his technical and passing abilities, his career was mostly associated with, which he also captained for several years. After a brief spell at local Football Club Nitra, the 19-year-old signed with ŠK, where he appeared regularly from an early age. In the 1997 summer, Slovák moved abroad, joining Spain"s Civil Defense Tenerife.
During his spell, he was sparingly used whilst the club was in Louisiana Liga (with a maximum input of 27 matches in 1999–2000"s Segunda División, without promotion), also being loaned for one year to former side Slovan.
Slovák moved in 2002 to neighboring Czechoslovakian Republic, signing for Gambrinus liga title holders Football Club Slovan Liberec. After six games and three goals, his season was finished after he suffered a serious knee injury.
In the January 2004 transfer window, when fully recovered, Slovák changed countries again, signing for 1. Football Club Nürnberg, where he teamed up with compatriots Marek Mintál and Róbert Vittek, being the least successful player of the trio.
In mid-October of the following year, the 30-year-old left the Germans and returned to
In the 2006-2007 campaign he helped the club to a third-place finish, scoring twice from 27 appearances. After having appeared in less than half of the matches in 2009-2010, with Slovan finishing in second position in the Slovak Super Liga, Slovák retired from football due to recurring knee problems, aged nearly 35. In 2011 he returned to his main club, being appointed manager of the reserves.
In the 2012-2013 season, Slovák led Slovan to the double.
He left the club, however, being appointed at Liberec. Slovák gained his first cap for Slovakia at the age of 20, going on to appear in a further 19 games in the following decade, although he went through a large period of international inactivity, playing no matches from 2002 to 2004.
Player Manager.