 Fahrenhorst left the club on 30 June 2009 at the end of his contract and joined MSV Duisburg until 30 June 2011.On 17 August 2010 he signed a two-year contract with FC Schalke 04 II.On 12 August 2004, Fahrenhorst was first invited to the senior national team of Germany, when he was nominated for the test match at the Ernst Happel Stadium in Vienna against Austria.