4) William Carvalho – Sporting Lisbon
The 22-year-old powerhouse is young and talented, but his Portuguese club want €46m for his services, reports Goal. This is astronomical for such an inexperienced player, especially considering a midfielder of Cesc Fabregas’s quality moved to Chelsea for £10m less than this fee already this summer. Carvalho prides himself on his power and energy rather than his technical ability, and United fans saw last term with Marouane Fellaini that this isn’t always ideal.