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The Portugal superstar has been left frustrated after seeing Juventus miss out on the Serie A title for the first time in a decade.
He's scored 101 goals for the club since arriving in 2018 but it hasn't been totally positive in Turin, with rumours suggesting he could leave.
Trezeguet, who worked for the club as an ambassador until last week, told Italian outlet Gazzetta dello Sport Ronaldo could be suffering from a 'lack of dialogue' within the team.
"It was the best signing from the club, nobody expected that," former Juve forward Trezeguet begun.
"There have been some problems with his teammates, and you could see that, but he's scored 100 goals.
"I think nobody has been able to manage him as Zinedine Zidane, perhaps there has been a lack of dialogue at Juventus at some point.
"One coach can tell a player: 'Look at this game, you walked for 90 minutes and you must help me win the games.
"There are players you don't want to have against you because they make you win the matches. Ronaldo is one of them, [Paulo] Dybala as well. Some of the others, with all the respect due, not as much."
Ronaldo arrived from Real Madrid after winning three successive Champions League titles under Zidane's management.
Juventus had hoped the 36-year-old's arrival would see them win their first major European honour since 1996.
But the last three seasons have seen them reach the quarter-finals twice and the last-16, losing to Ajax, Lyon and Porto respectively.
Reports have claimed Juventus already have a three-man shortlist prepared to replace Ronaldo - with Gabriel Jesus, Mauro Icardi and Dusan Vlahovic included.
Trezeguet also named a massive mistake the club made in the transfer market - selling Kingsley Coman.
The France winger joined from Paris Saint-Germain as a teenager and only made 22 appearances before joining Bayern Munich on loan in 2015.
Two years later, Bayern made that deal permanent and Coman has become a key player in attack.
He's scored 41 goals and provided 50 assists, with one of those goals coming in Champions League final victory against PSG last year.
Do you think Cristiano Ronaldo's move to Juventus has been a success? Will he leave this summer?
Let us know in the comments.
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