Jürgen Klopp
Following his playing career, Wagner became a manager, working mostly with his former 1. Mainz 05 teammate Jürgen Klopp. Wagner was appointed as Borussia Dortmund II manager with effect from 1 July 2011. He left the role on 31 October 2015, amidst rumours that he was going to join Klopp's backroom staff at Liverpool.