Ronaldo: Today any player can go for 100m euros, even without demonstrating anything Serie A Doesn't agree with high fees

Cristiano Ronaldo has questioned whether players who go for big money in today's transfer market are actually worth the fees paid for them.

Ronaldo broke the world transfer record in 2009 when he moved from Manchester United to Real Madrid for 94 million euros, before going for another 100 million euros when he joined Juventus last year.

"It's difficult to make calculations in modern football," Ronaldo told Portuguese channel TV1.

"[Clubs] gamble a lot on potential and the football industry is different.

"Leaving the case of Joao Felix to the side, any player can go for 100 million euros, even without showing anything.

"There is more money in football.

"A centre back and a goalkeeper can go for 70 or 80 million euros.

"I don't agree [with it] but it's the world that we live in and you have to respect it."