4. David Luiz (Chelsea, from Paris Saint-Germain for £30 million)
There were plenty of critics when Chelsea splashed the cash on David Luiz on deadline day, with many claiming that the move was a panic buy to fill a gap in defence, with the Brazilian set to produce the kind of headless chicken displays that he became famous for in his first stint in England.
Since then, Luiz has defied expectations. Replacing captain John Terry in the heart of defence, Luiz has looked assured and comfortable throughout, with his strength in the challenge and in the air becoming crucial to his team’s race to the Premier League title.
Posing a threat when going forwards and also scoring a memorable free-kick against Liverpool, Luiz has been crucial in starting moves from the back as well as adding defensive solidity. He may not have come cheap at £30 million, but he certainly could prove to represent value for money in the long term.