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's first exposure to the UEFA Champions League came with four appearances, including games against Lyon, Inter Milan, and Roma. He reached the quarter-finals but was eliminated by Milan in a 2-3 aggregate defeat.