Cadena SER are reporting that Messi would see out his £500,000-per-week contract at the club before moving on next summer.
"With all this speculation, I believe that some agents are already dreaming about a Messi-Ronaldo double at Juventus and how big it will be around the globe," Rivaldo told Betfair.
"If that happened there would be a world 'boom', and I believe Juventus would quickly recover any investment on the Argentinian thanks to the boost they would get from visibility and marketing.
"It would be historical to see both playing together and I'm sure many Juve sponsors would love to help financially, so, it's also a possibility for Messi.
"If there are rumours about his exit, then of course every club will be thinking about how they can sign him.
"That said, the two best players in the world for the past 10 years playing at the same club would be massive."