10. Jack Wilshere
How much would Jack Wilshere go for if he was sold this summer? £40m, maybe even £50m?
Then consider that the Arsenal star won't hit his peak for another five or six years - by which point he should be one of the world's leading central midfielders.
The England international could, if he continues improving and avoids serious injury, be worth over £86m by 2020.
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