9. Wayne Rooney | Manchester United
Highest market value: £57m (d.o.v - February 6, 2012)
Current market value: £39.5m
Rooney was at his most valuable when he was Manchester United's sole striker - pre-RVP - and at the perfect age in terms of quality and sell-on potential, around 26-years-old.
He was also mid-way through one of his most prolific campaigns - he hit 27 in 34 Premier League appearances during the 2011-12 season.