 Deac was finally signed by CFR Cluj during the 2005–06 season, and made his Liga I debut on 6 August 2006 against Unirea Urziceni in a 4–0 victory.During the 2006–07 season led by coach Cristiano Bergodi, he only made eleven appearances for them finishing third place in the Championship.The highlight of his career began in 2007–08 the team's new coach, was Ioan Andone, formerly of Dinamo Bucureşti who won both the Championship and the Cup.