Jens Lehmann
Weidenfeller moved to Borussia Dortmund in 2002 on a free transfer as a possible replacement for Jens Lehmann, who had moved to Arsenal in 2003. Weidenfeller had reportedly been unhappy at Kaiserslautern, where he was used mainly as a backup to Georg Koch. His debut for Dortmund came on 17 December 2003 against his former club, Kaiserslautern, in a 1–0 loss.