Ousmane Dembele\n\n His transfer to Barcelona from Borussia Dortmund remains the most expensive ever involving a Bundesliga club. Dortmund received 105 million ( 118 million) plus further add-ons. Not bad for then 20-year-old, but Dembele hasn't quite made his mark in Spain yet.

The decision by the German Football League to allow a private equity investor for the next two decades has sparked backlash from fans. In one incident, Hansa Rostock fans threw pyrotechnics, injuring police.