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Borussia Dortmund's sporting director Michael Zorc has extended his contract ahead of scheduled, signing on a contract extension, which will keep him with the German football club until June 2021. "Despite winning the German Cup and qualifying for the UEFA Champions League, it has been difficult for many reasons in the past year and a half. I regard it all the more as our common task to bring Borussia Dortmund into calmer waters," Xinhua news agency quoted Zorc as saying in a statement on Monday.