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Schalke 04 was the club where Jens Lehmann began his professional football career. He joined the club's youth academy in 1989 and made his senior debut in 1991. Lehmann spent five seasons with Schalke 04, making over 100 appearances for the club. During his time at Schalke 04, Lehmann helped the team win the DFB-Pokal in 1993 and the UEFA Cup in 1997.