6. Andres Iniesta | Barcelona
Highest market value: £61.5m (d.o.v - August 7 2012)
Current market value: £57m
Position: Attacking midfielder
If Xavi peaked during the victorious 2010 Spain campaign, then Iniesta did two years later following the Euro 2012 triumph.
Aged 27, he was at the top of his game and still possessed considerable sell-on value should Barcelona have decided to do the unthinkable.