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DORTMUND, GERMANY - NOVEMBER 26: Juergen Klopp the Dortmund manager scratches his head prior to the UEFA Champions League Group F match between Borussia Dortmund and SSC Napoli at Signal Iduna Park on November 26, 2013 in Dortmund, Germany. (Photo by Dennis Grombkowski/Bongarts/Getty Images)

DORTMUND, GERMANY - NOVEMBER 26:  Juergen Klopp the Dortmund manager scratches his head prior to the UEFA Champions League Group F match between Borussia Dortmund and SSC Napoli at Signal Iduna Park on November 26, 2013 in Dortmund, Germany.  (Photo by Dennis Grombkowski/Bongarts/Getty Images)