In addition, Sikora gained his first experience in the UEFA Champions League, where he made four appearances, including in matches against Lyon, Inter Milan and Roma, and made it to the quarter-finals of the competition, where, however, they were defeated by the eventual winners Milan after a 2–3 loss on aggregate.
Sikora gained his initial experience in the UEFA Champions League, participating in four matches, including against Lyon, Inter Milan, and Roma, and advancing to the quarter-finals where they were defeated by eventual champions Milan after a 2–3 aggregate loss.