Aljaž Osterc starts for SSK Velenje . He made his debut on September 13 and 14, 2014 in Einsiedeln in the Alpencup , where he finished 58th and 46th. In March 2016, Osterc started in Planica for the first time in the FIS Cup and reached positions 15 and 14 there.
On August 20 and 21, 2016, Osterc made his debut in Kuopio in the Continental Cup and reached places 5 and 24. His best placements in the Continental Cup so far were at the competitions in Engelberg on December 27 and 28, where he once won took second and once third place.
At the Slovenian Championships in Planica in 2016 , Osterc took sixth place in the individual competition. On January 15, 2017, he made his debut in the World Cup in Wisła, Poland, and narrowly missed the points in 34th place.