And who is the worst?
ESPN FC asked their club bloggers for their all-time football tops and flops in the transfer market.
Let’s take a look at who they chose for Manchester United Football Club:
Eric Cantona.
Without him, who knows what Manchester United would have achieved over the next couple of decades. He was the catalyst for all the glory that followed his 1992 arrival from arch rivals Leeds. He cost just £1.2m — one of the best value transfers in the history of the game, let alone the Premier League..
Bebe.
He cost an small fortune (£7.2m) in a deal that aroused plenty of suspicion — and Sir Alex Ferguson admitted he had never watched him play before making his move. He was atrocious. — Scott Patterson