Milan Skriniar
At 24 years of age, the Slovakian is seen as one of the most promising young defenders in the world, and he has been part of an Inter Milan defence that has conceded just 15 goals in 18 league games this campaign.
Skriniar did sign a new contract with the Nerazzurri last May so he would cost a fair amount, but he would be an investment with his best years ahead of him.