'Nothing to prove....' says Klopp. Jurgen Klopp insists he has nothing to prove as he prepares for his first return to Borussia Dortmund. The Liverpool boss spent seven years in charge at Signal Iduna Park, and will take his Reds side there for tonight’s Europa League quarter-final, first-leg clash. Klopp’s time in Dortmund ensured him legendary status, with two Bundesliga titles, a German Cup, two German Super Cups and a memorable run to the 2013 Champions League final. Now, at Liverpool, he is trying to write similar stories, though his new side will be underdogs against his old one. More: Klopp: Dortmund know me - I have nothing to prove with Liverpool. ( Liverpool Echo )