Ronaldo and Messi have milked the limelight for over a decade and they continue to go strong despite entering their thirties.
The duo have won every Ballon d’Or award since Kaka back in 2007 and are now tied on five each.
Guardiola knows what Messi is like first hand from his time at Barcelona and believes he and Ronaldo are a level above every other player in world football.
“Leo is a competitive, fierce animal,” he told reporters at Festival dello Sport.
“That helps others to be competitive. He hates to lose and plays like when he was a kid. In big matches, if the team helps him, he makes the difference.
“Together with Cristiano [Ronaldo] we have lived and are living an era of two phenomena.
“They have spent 10 years scoring 50 goals a season. It’s incredible. It’s not one year, it’s year after year, more and more.”
Luka Modric is the frontrunner to win the Ballon d’Or this year as the Croatian captain recently picked up the FIFA award for Best Men’s player.
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Real Madrid and Spain captain Sergio Ramos believes Harry Kane has all the necessary skills to be a star in La Liga.
The two-time Premier League Golden Boot winner Kane has long been linked with a move to Los Blancos.
The Tottenham star has scored five goals this season and Ramos singled out the England frontman ahead of Monday’s Nations League clash in Sevilla.
He said: “(All the players) are really impressive.
“It’s true that what shines the most in the Premier League is the physical form but they have players with lots of quality.
“Harry Kane for example is a really physical striker but also really skilful, he surprises lot of defenders but he won’t surprise me.
“They have many other strikers that are really dangerous and unbalancing, I can assure you we have studied them really well so they won’t do their best.”
Kane, who won the World Cup’s Golden Boot in July, has not scored in his last six international matches following England’s goalless draw against Croatia on Friday.
The 19-year-old is among the nominees for this year’s award, although the attacker is not considered among the favourites with Luka Modric, Cristiano Ronaldo and Mohamed Salah leading the votes at present.
However, Matuidi believes Mbappe – who was named the best young player as Les Bleus clinched the World Cup in July – will win the prestigious individual prize one day.
“He’s among the nominees so he can win. He’s shown that he is a great player despite his young age,” said the 31-year-old.
“What he shows on the pitch is very impressive. We also see it in training. We are very happy to work with him.
“I’m not going to give favourites because I don’t want to have enemies in the group. May the best man win.
“But Mbappe has everything to win the Ballon d’Or this year or in the future.”