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Lewis Holtby began his professional career with Alemannia Aachen in 2007. He made his debut for the club in the 2. Bundesliga on 15 December 2007, coming on as a substitute in the 88th minute of a 2-0 defeat to MSV Duisburg. He went on to make a total of 22 appearances for the club, scoring one goal. In 2009, he moved to Bundesliga club Schalke 04.