Barcelona star Messi, 33, stunned the footballing world by announcing he wanted to quit earlier last week.
The Argentine has since been linked with moves to Man City, to team-up with Guardiola, and Juventus, to partner Ronaldo.
Guardiola was even spotted in Barcelona amid rumours the Etihad side were close to sealing a deal worth a staggering £1.4million a week.
But former PSG and Newcastle star Pancrate – who played for the club between 2004 and 2009 – reckons they’ll all end up in Paris.
Pancrate told Le Parisien: “I’ll tell you what I think… Manchester is ugly, it’s grey, it’s raining.
“There are plenty of things that make me say that Messi is going to Paris.
“And Ronaldo will join him in 2021. And Guardiola too.”
Despite Ronaldo and Messi both embarking on the final years of their careers, Pancrate doesn’t believe that would be an issue in France.
He added: “Even though people say Messi is already 33, and that Ronaldo is going to be 36, stars of their calibre don’t need to run.
“It’s the ball that moves… they will always make a technical difference.
“If you take [Gianluigi] Buffon or David Beckham at 37, with a marketing side that no one hides, it makes perfect sense to take a Ronaldo.
[He] is still very competitive, very professional, who is afraid of nothing.
“Paris has everything to gain. It’s too premature for [Ronaldo] to leave the European scene. He needs ever higher challenges.
“Who can offer him that after Juve? Can you imagine this dream team?”