3. Ronaldinho | Atletico Mineiro
Highest market value: £70.5m ( d.o.v - September 9 2007)
Current market value: £1.3m
Position: Attacking midfield
If there's one player of the last ten years who you would reasonably expect to fetch a Bale or Ronaldo-like transfer fee if they were playing today - it would be Ronaldinho.
The Brazilian would easily smash the transfer record if he moved clubs at his peak in today's football market.
According to the data, his peak value was around 2007 - that's not to say he was necessarily playing his best football then.
But he'd demonstrated his value and was the right age to extract the most expensive possible price.
Nowadays, a 33-year-old Ronaldinho would barely fetch £2m.