 Playing as a professional with Ružomberok between 2003 and 2006, he scored 30 goals in 56 league games.In 2006, he won the Slovak league and cup double with the club, also being the country's top goalscorer for the 2005–06 season with 21 goals, alongside Róbert Rák.In the summer of 2006, Jendrišek was signed by Hannover on a season-long loan deal with the option of a permanent deal at the end of the season.