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Born in Karlsruhe, Germany, Wellenreuther played for various youth teams, starting with SC Bulach, SVK Beiertheim, SpVgg Durlach-Aue, Astoria Walldorf and Karlsruher SC. It was announced in March 2013 that Wellenreuther joined Schalke 04 in 2013 from Karlsruher SC.