The ex-Roma and AC Milan forward told Gazzetta dello Sport: "It goes without saying now, Juventus have the Scudetto sewn up until 2022".
"Since I was a child, I looked at this team and I hoped one day I could play there", added the Portugal captain.
"I don't have a precise moment when I decided [to join]".
"We've met Juventus on a couple of occasions in recent years and I've always had the feeling that Italian fans liked Cristiano".
"It's the biggest club in Italy, one of the best in the world, so it was an easy decision, as Juve are an unbelievable club".
Ronaldo scored 450 goals in nine scintillating years at Real Madrid but now embarks on a new challenge in Italy at the age of 33.
The five-time Ballon d'Or victor was heralded by Juve supporters after he netted a stunning overhead kick goal in the Champions League. It was an unbelievable feeling. When the time came, they dumped the Brazilian Ronaldo and David Beckham, so I'm not surprised they treated Cristiano like that, too.
"I know Real Madrid well and all that counts, even for Florentino Perez, is the club". I won't say it was the key point in my decision, but every detail helps. Maybe. Of course, it helps when you see the people like you, the supporters and club like you, the feeling is completely different.
"I have to say thank you to all of them for the support".
"My priority is to do my best, be professional, try to make the team even better", he said.
"My first goal will happen in a natural way, I'm not thinking about that".
As for his first goal, he said he has not even thought about it. "It's different here, it's like a family". The supporters are the same. "I am very excited to be here, and I want to make everyone happy", he said.