Ronaldo's future at Juventus is currently uncertain after a frustrating season for both player and club.
Juventus produced its worst Serie A finish in a decade, ending the campaign in fourth before manager Andrea Pirlo was sacked and replaced with the club's former manager Massimiliano Allegri.
Amid the disarray over Ronaldo's future, Matallanas says Laporta wants to pounce and bring Ronaldo to Barcelona.
"With Messi's future pretty much sorted, last week Laporta let his imagination run wild and began to think about a deal that sounds impossible," he wrote in Spanish newspaper AS.
Laporta said last week that Messi, who tried to leave Barcelona last summer, is ready to sign a new contract, however that financial regulations are preventing the the club from making an announcement.
"He is dreaming of bringing Messi and Cristiano Ronaldo together at Barça," Matallanas, a well-respected voice in Spanish soccer, continued.
"Alongside his closest aides, Laporta began to map out a move that would go down in footballing history: fielding a team boasting the two stars who have dominated the men's game for the past decade and more.
"As part of Laporta's bold plan, Barça would offer two players to Juventus, with Antoine Griezmann, Sergi Roberto, and Philippe Coutinho thought to be among those in contention to go to Turin."
Matallanas added that while Ronaldo currently earns $37 million per year, if Barcelona can find a way to pay his wages, the club's revenue "would be doubled by having Ronaldo and Messi in the same team."
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"Laporta's idea has been met with enthusiasm by those around him. It's a long shot, but even thinking about bringing Ronaldo and Messi together is a stroke of genius," he said.
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