Jancevski was drafted 66th overall in the 2nd round of the 1999 NHL Entry Draft by the Dallas Stars. In 2006, he signed with Montreal as a free agent; he was then assigned to the Canadiens' AHL affiliate, the Hamilton Bulldogs, where he helped the Bulldogs to the Calder Cup.
Jancevski signed a one-year deal with the Tampa Bay Lightning on July 6, 2007. He started the 2007-08 season with the Lightning's affiliate, the Norfolk Admirals. He received his first recall on November 21, 2007 and played in 2 games before he was returned to the Admirals. Jancevski was then traded back to Dallas for Junior Lessard on January 15, 2008.[2]
On June 9, 2008, Jancevski was re-signed by the Stars to a two-year contract.[3]