Al-Nassr star Cristiano Ronaldo is having a significant influence behind the scenes at the Saudi Arabian club.

The Portuguese veteran is a legendary figure in the sport, having won the Champions League on countless occasions and won league titles in England, Spain, and Italy.

Per Spanish publication Ideal, Spanish nutritionist Jose Blesa has revealed Ronaldo's attention to detail when it comes to his diet.

“I was uncertain, like everyone else, about what it was going to be like to work with him and if the club was going to change a lot, but I haven't found a more professional footballer than him... He is the first to arrive at training and the last to leave," Blesa said.

“Cristiano helps me a lot, because we can no longer teach him anything, but he creates a school around him.

“The rest of the players do what he does because everything he does is wonderful to improve his performance.

“Since he has been here, all the players have trained more intensely and followed a stricter diet.

“I have not seen a club like this in which the players improve practically 90 per cent in their body composition. Every time I see them, they have less fat, more muscle and they do all the exercises at their fingertips. It is a luxury to work there."