2) Marcos Rojo
The 24-year-old Argentine has been hugely impressive for his country in recent times, playing as either a full-back or a centre-back.
Sporting Lisbon paid just £3.5 million for his services in 2012, when he moved from Spartak Moscow, and the Portuguese club will be hugely confident of make a big profit on their investment, with Rojo having finally realised his potential as one of Argentina’s greatest defensive prospects.