Since 2008, he has been the head coach of the Slovakia national team. On 14 October 2009, he led the team to the historic success of Slovakia's first-ever qualification for a major tournament, with Slovakia winning the qualifying group thanks to beating Poland 1–0 in an away match in the final qualifying game. On 24 June 2010, he led his Slovakia side to the World Cup last 16 after a 3–2 win over Italy. In late January 2012, he parted ways with Slovakia on his own accord following the team's failure to qualify for the Euro 2012 tournament. Nowadays Weiss works in Kazakhstan, in the football club of Almaty, FC Kairat, which is very famous on the all territory of CIS.