On the training pitch, Klopp was forming his own double-act with manager Wolfgang Frank. Frank is widely credited as being one of the first German managers of the era to play the Viererkette: doing away with the sweeper that was in vogue at the time, in favour of a four-man zonal defence and diamond midfield. Klopp was strongly influenced, and in his recent Dortmund teams you can see echoes of Frank’s ideology: the high press, the immaculate choreography of the back four, overloading the flanks.