Football finance experts feel it is only a matter of time before a club pays £100 million for a player.
Dan Jones of the Sports Business Group at consultants Deloitte said the sheer amount of money meant it was only a matter of time before Spurs' record-breaking £85 million sale of Gareth Bale to Real Madrid is eclipsed.
He told BBC Five Live: "Obviously you need the right player to be on the market for that to happen. A lot of things came together for the Bale deal as they did for Ronaldo four years ago.
"But for the right player, a player who has an amazing World Cup or European championships, I could definitely see it happening in the next few years."
