In 1992, Büskens moved to FC Schalke 04, and lived the most successful years of his career. He was part of the UEFA Cup and German Cup 2001 and 2002 winning squads, and never appeared in less than 27 league games in his first seven seasons. In the European conquest of 1997, he played in 10 matches (eight complete), including both legs of the final against F.C. Internazionale Milano.