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epa03918128 Schalke players Benedikt Hoewedes (L-R), Kyriakos Papadopoulos, Dennis Aogo, Atsuto Uchida, Adam Szalai, Joel Matip, Kevin-Prince Boateng and Jermaine Jones warm up during a training session at Veltins-Arena in Gelsenkirchen, Germany, 21 October 2013. FC Schalke 04 will face FC Chelsea in an UEFA Champions League group match in Gelsenkirchen on 22 October 2013. EPA/JAN-PHILIPP STROBEL