Former Chelsea and Tottenham star Gustavo Poyet is aware of short-term football revolutions.

The ex-midfielder has coached in China, when he worked at Shanghai Shenhua in 2016.

At that time, the Chinese were spending huge sums to lure players and coaches from Europe, but the spree was short-lived.

Poyet was asked for his thoughts on the investments that Saudi Arabia are making in the sport.

“When Ronaldo went there we all thought, ok, he's Ronaldo, he's unique. One of the best players in history," said Poyet to The Mirror.

“But what's happening in Saudi Arabia this season is crazy, just crazy."

"People are trying to compare it with China," he continued.

"Well I was in China, at that time (of big spending), and I don't think you can compare it. This is way, way, over that.

“Now where is this all going to go in Saudi Arabia? Is it going to be maintainable for the next 10 years, forever? Or will it be 'boom' for two or three years then that's it? And that's the situation that young players need to think about.

“The experienced ones, ok, they can go there for a few more playing years. It's a different situation, a different decision. Take Benzema for example, he's been at Real Madrid for 15 years and he's won everything and is no longer playing in the national team. He's gone at the end of his career."