The Portuguese whiz showed up in Turin in 2018 with the point being to push Juventus to Champions League greatness.
That point stays unfulfilled, and Cassano feels Juve failed in marking the five-time Ballon d'Or champ from Real Madrid.
"Juventus marked him to win the Champions League, however they've done more regrettable with him than they've done previously," Cassano said to Corriere dello Sport.
"They would have won the Scudetto [Serie A title] without him. It was some unacceptable undertaking.
"He'll continue to score objectives since he realizes how to do that regardless. He'll cut in from the left, get the ball on his correct foot and fire it in. His headers are interesting.
"However, [head mentor Andrea] Pirlo needs to assemble the play, pressure the resistance and play between the lines, and this implies Cristiano doesn't take part a lot.
"I figure he will have done seriously except if they figure out how to win the Champions League."
The 36-year-old has won consecutive Serie A titles with Juventus, alongside two Supercoppas, and he was named Serie A player of the year in 2019.
Be that as it may, in his two finished Champions League seasons with the club, they have been taken out in the quarter finals and the round of 16.
In the current mission, Juventus trail Porto 2-1 after the principal leg of their last-16 tie, with the subsequent leg to occur on March 9.
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