Pep Guardiola believes Lionel Messi is undoubtedly the greatest player of all time, describing arguments in favour of Pele or Diego Maradona as "sentimental".

Messi has long been considered among the best ever, but both he and Cristiano Ronaldo trailed Pele and Maradona in the eyes of some while neither had won the World Cup.

That changed on Sunday, when Messi led Argentina to glory at Qatar 2022, matching Maradona's achievement from 1986.

However, in the eyes of Manchester City manager Guardiola, who coached Messi at Barcelona, there was never any doubt.

"Everyone has their opinion, but nobody can doubt he's there with the greatest of all time," Guardiola said. "For me, I've said many times: he's the best.

"It's difficult to understand how a player can complete what he's done in the past 50 or 70 years.

"The people who saw Pele or [Alfredo] Di Stefano or Maradona, the people can say 'my favourite', but these opinions are sentimental.

"On the other side, if he wouldn't have won the World Cup, the opinion about what he has done for the whole of football and my opinion of how he is as a player wouldn't change absolutely anything.

"But it's normal that it depends if you win [how] you are evaluated. Of course, for him, it's the final cherries on his incredible career."

Messi was joined in the Argentina side by City striker Julian Alvarez and Nicolas Otamendi, who spent five years at the Etihad Stadium between 2015 and 2020.

"We are incredibly happy for him [Alvarez] – congratulations," Guardiola added. "For him, for Nico Otamendi, personally for Messi, for Argentina the country, for a well-deserved champion.

A dream come true! @julianalvarezzz pic.twitter.com/y4lswDWShF
— Manchester City (@ManCity) December 18, 2022

"For Julian, he is with us, and we are delighted. He played a lot, and his contribution was amazing to the team for the way we played. We have a world champion in our team."

Guardiola confirmed Alvarez would now enjoy "a break", but City's other World Cup stars have started to return ahead of Thursday's EFL Cup fourth-round tie against holders Liverpool.

"The players that were at the World Cup are in a better condition than the players who were here, that's for sure," Guardiola explained.

"Sergio [Gomez], Erling [Haaland], Riyad [Mahrez], Cole [Palmer]... the rhythm they miss a little bit compared, for example, to Manu Akanji and Rodri and Aymeric [Laporte] and Nathan [Ake].

"They came back and we saw them so good, perfectly. That's normal. They compete, they train every day, while we had holidays."