3. Ousmane Dembélé (Borussia Dortmund to Barcelona, 2017) €148 Million
Ousmane Dembélé arrived at Barcelona in 2017 for big money, hoping to be a long term replacement for Neymar. The French winger was a revelation at Borussia Dortmund where his pace, skill and creativity impressed.
Most of Dembélé’s time with Barcelona was hampered by injury, but when he has been fit he has shown signs of his potential. His transfer underscores the danger and reward of putting lots of money into young talents.

Though he also failed to live up to his expectations due to injuries. He was later transferred to PSG.