Man United overpaying for a 30-year-old Casemiro, Chelsea's £230m splurge on two midfielders and Dortmund's unmatched strategy... the top 10 biggest transfer profits in the last decade

Neymar 's near-£200m transfer to PSG from Barcelona in 2017 turned the football world on its head and ushered in the future of absurd fees we see today.