5. Kaka | AC Milan

Highest market value: £61.5m (d.o.v - September 11 2007)

Current market value: £7m

Position: Attacking midfield

Remember when Manchester City tried to sign Kaka for €100m - that was just one year after his value peaked. City dodged a bullet there.

He was at his most valuable to AC Milan in 2007, a few months after their Champions League win over Liverpool.

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