3. David de Gea
Manchester United's £18.9m capture of David de Gea in 2011 was the second most expensive transfer fee paid for a goalkeeper in the history of the game, all for a player aged just 20.
De Gea struggled to cope with the physical demands of the Premier League during his first full campaign, coming in for fierce criticism and a fight for a starting spot from Anders Lindegaard.
Spain's stunning young stopper has stayed strong despite those knocks though, proving a consistent performer on United's comfortable march towards the title last season and even during a turbulent campaign at Old Trafford this time round.