[2] Auxerre's manager Jean Fernandez has described Jeleń as the player in his squad having the most ability in front of goal.

He finished fifth in the Ligue 1 goalscoring charts with 14 goals, despite missing some matches due to injury.

He returned to Poland and signed for Ekstraklasa side Podbeskidzie Bielsko-Biała but after a poor half of the season he was released.

Since 2019, Jeleń has been playing for CKS Piast Cieszyn at amateur level, where he also serves as the club's chairman.

He was selected for the 23-man squad that took part in the 2006 FIFA World Cup finals in Germany and played in all three of the Group A games, almost scoring with an impressive left foot shot that hit the crossbar against Ecuador in their 2–0 defeat.

[11] Jelen failed to make Poland's squad for their upcoming Euro 2012 campaign, however he was placed on standby.