Ulm

He began at second-tier German side Stuttgarter Kickers, before three years at third division team SSV Ulm until a serious knee injury ended his playing career in 1998, when he was 25.

His boss at Ulm was Ralf Rangnick, who went on to manage Schalke, RB Leipzig, Manchester United and is now Austria's head coach.

He joined Stuttgart Kickers in the German second tier, before dropping to the fourth division to play for SSV Ulm.

Tuchel began coaching during his final season at Ulm, as well as studying for a business degree and working in a cocktail bar.

A team of researchers from Charité -- Universitätsmedizin Berlin, Uniklinikum Erlangen and Ulm University have now explored the molecular mechanism of action in greater detail.