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Featured Image Credit: PA
The five-time Ballon d'Or winner has scored 90 goals in 117 appearances for the Bianconeri since joining in a mammoth £88 million move in 2018.
But Ronaldo, having won three Champions Leagues on the trot at Real Madrid, has been unable to bring the European crown in Turin.
The team were knocked out by Ajax in the quarter finals in 2018/19, before Lyon dumped them out in the round of 16 last term.
And for that reason, former striker Cassano believes Ronaldo cannot be considered a success.
"He [Ronaldo] has another year left in his contract, Juventus signed him to win the Champions League, but they have had worst results since he arrived," the 38-year-old said, as per Football Italia.
"They would have won Serie A titles also without him. It was the wrong project. For 120 years, winning was the only thing that mattered at Juventus. It is still an obligation, but they tried to change their skin with Sarri and Andrea [Pirlo].
"Ronaldo has nothing to do with Pirlo's ideas. He will carry on scoring because he can do it even sitting. He cuts inside from the left and can destroy the goal and his headers are unique.
"Andrea wants to build the action from the back, he wants to press high on the pitch. Ronaldo can decide games, but he doesn't participate much. I think he did badly in these years unless they manage to win the Champions League."
Juve could well experience Champions League disappointment yet again, with Andrea Pirlo's side 2-1 down to Porto going into the last 16 home leg on 9 March.
Ronaldo, the highest scorer in the history of the Champions League, was especially below par in the first leg and received a social media rinsing for running into teammate Alex Sandro in a "disasterclass".
If you're chasing a game, don't get in a teammate's way...- Football on BT Sport (@btsportfootball) February 17, 2021
Especially if that teammate is Ronaldo! :triumph:
Alex Sandro sums up a disappointing evening for Juve :pensive: pic.twitter.com/COou2DoQsY
Cassano has been a regular critic of Ronaldo,calling him "a manufactured talent" and stating that long-time rival Lionel Messi "has immense talent".