3. Kaka

Bought for: £6m by AC Milan on 14.08.2003

Sold for: £57m to Real Madrid on 01.07.2009

Profit: £51m

It's easy to forget that Kaka had the world at it's feet during a sensational first spell at AC Milan, with the Serie A giants forced to deal with the constant threat of losing their star man at a time when he was arguably the most consistent player in European football.

Kaka famously turned down a world-record move to Manchester City but was eventually lured away by Real Madrid in 2009, albeit for a healthy profit exceeding the £50m mark.

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