After signing a pre-contract deal in July 2009 to join Dundee United in January 2010, Dušan made his debut in the January 2010 2–0 Scottish Cup win against Partick Thistle, also keeping a clean sheet on his league debut four days later. Perniš kissed silver for the first time on 15 May 2010, when he kept a clean sheet in the Scottish cup final for Dundee United when Dundee United beat Ross County. After the match, Perniš says winning the Scottish Cup and revealed he cannot wait to show it [medal] to his family; he also cannot wait to have a challenge by playing in European game. Since moving to Dundee United, Perniš says he is now settled very well at the club, but desires to play in the Premier League in the future.