6) Kaka – £56m
Kaka became the world’s most expensive player when he moved to Real Madrid from AC Milan in 2009, but it’s fair to say he never lived up to the whopping fee.

6) Kaka – £56m
Kaka became the world’s most expensive player when he moved to Real Madrid from AC Milan in 2009, but it’s fair to say he never lived up to the whopping fee.