Money in football is spiralling out of control.

10 years ago, Cristiano Ronaldo sealed a world record £80m move from Manchester United to Real Madrid.

Question marks were raised about the transfer at the time, although he would go on to prove that he was worth every penny.

Fast forward 10 years and now that fee is only the 11th highest transfer fee ever paid for a player.

The likes of Philippe Coutinho, Antoine Griezmann and Joao Felix have all cost more.

Ronaldo gave his thoughts on the current market in an interview with Portuguese TVI.

"Today there is a lot of emphasis placed on potential and the football industry is different," he said, per ESPN.

"I'm going to put aside [Portugal international Joao] Felix's [€120m transfer to Atletico Madrid from Benfica] case. Nowadays, any player is worth €100m having proved nothing, there is more money in football.

"A goalkeeper, a centre-back is worth €70m, €80m -- I don't agree. But this is the world which we live in, the market is like that and you have to respect it.

"Is there a football player that has more records than me? I don't think there is a player that has more records than me."

Ronaldo was then asked how much he thinks he would be worth in today's market.

"If I were 25, if a goalkeeper is worth €75m, a player that does and has done what I have done in recent years has to have a value of three or four times that, easily, but I no longer have that desire," he said.

It's hard to disagree with him.

Neymar is the world's most expensive footballer, having signed for PSG for €222m in 2017.

With all due respect to the Brazilian forward, Ronaldo is a superior player.

Surely the world's best clubs would happily pay €300m for a prime Ronaldo if they had the money.

Ronaldo also hinted he could retire next year if he loses his motivation for the game.

"I know I'm already in the history of football. I know that I'm one of the best in my field but that is not by chance. I could end my career next year but I could also play until I'm 40 or 41," he added.

"It's about the challenge. I still feel motivated to win individual and collective trophies, and if I wasn't, I would end it [career].

"I have everything I want, I have an excellent family, I have spectacular businesses. From a financial standpoint, I'm very well. I don't need football to live well. I will live well all of my life.

"What I always say to myself is to enjoy the moment. My present is excellent and I have to continue to enjoy myself. I look at it as projects and the enthusiasm [they bring.]"