He made his first appearance for Litex in a Champions League qualification match against Widzew Łódź, on 28 July 1999.

On 29 August 2002, Jelenković scored his first-ever European goal in a 3–1 away win over Lithuanian Atlantas Klaipėda in their 2002–03 UEFA Cup qualifying round second leg tie.

[2] In 2006, Jelenković was on the radar of then Bulgarian manager Hristo Stoichkov as a prospective candidate for the national team, but eventually did not meet the eligibility criteria because of having appeared in matches for the FR Yugoslavia U-21.

In December Jelenković returned to Litex and earned 12 appearances in the Bulgarian A PFG, scoring one goal to the end of the season.

[9] He has featured on 293 occasions in the A PFG and is currently second on the all-time appearance list among foreign players in the top flight of Bulgarian football (after Macedonian Vančo Trajanov).