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That's according to Piers Morgan, who lauded the 36-year-old Portuguese superstar for becoming the first player to finish top scorer in the Premier League, La Liga and Serie A.
Ronaldo scored an impressive 29 times in 33 appearances in Serie A this season as Inter Milan dethroned Juventus from the top of Italian football.
The Juventus forward's 29-haul puts him well clear of second-place Inter Milan striker Romelu Lukaku (24) and third-place Atalanta star Luis Muriel (22).
Ronaldo scored 21 times in Serie A in his debut season for Juventus and finished five behind Sampdoria captain Fabio Quagliarella in the race for the Capocannoniere.
The five-time Ballon d'Or winner once again fell five short in the following campaign as Lazio star Ciro Immobile's 36 goalscoring haul fired him to the Capocannoniere.
But now Ronaldo has added top scorer in a Serie A season to his ever-growing accolades.
Morgan, who has been a long-time admirer of the Portugal captain, praised him on social media after he achieved the top scorer feat in England, Spain and Italy.
The 56-year-old tweeted: "Messi's a genius but he's never challenged himself in different leagues like Ronaldo. That's why @Cristiano is the [GOAT]."
Ronaldo was awarded the Premier League Golden Boot during the 2007-08 season after he scored an incredible 31 times en route to Manchester United winning the league title.
The former United superstar received the Pichichi Trophy on three occasions after finishing as La Liga's top scorer.
Juventus managed to secure Champions League football for next season as they finished fourth in Serie A after their 4-1 win over Bologna on Sunday.
Ronaldo was an unused substitute for the clash at the Renato Dall'Ara as Juventus boss Andrea Pirlo said it was a "shared decision" to rest him.
Speaking ahead of the Bologna clash, Pirlo insisted that the Madrid legend remains an integral part of his Juventus plans and he wants to keep him in Turin.
The 42-year-old Italian legend explained: "I see him still in the Bianconero jersey and focused.
"He proved it the other night, sacrificing himself because he wanted to win the Coppa Italia.
"I see him focused on tomorrow, then there's time to discuss the rest."
Featured Image Credit: PA
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