After nine years at Real Madrid, Ronaldo made the decision to leave Spain and join Juventus, the most dominant team in Italy.
And unsurprisingly the Portuguese star adapted seamlessly to with 20 goals so far this season.
Ronaldo’s arrival came after Gianluigi Buffon left Turin for Paris Saint-Germain.
Chiellini took over as Juventus captain and in an interview with Italian publication La Stampa, he opened up about replacing Buffon as skipper and compared Ronaldo to two of sport’s greatest ever.
“Replacing Buffon is not easy at all,” Chiellini said.
“As captain, you do not need to do the jobs of the others.
“But, you have to help maintain a balance [in the squad], and in a multi-cultural dressing room which includes many different backgrounds, habits and religions, it’s not always easy, but sharing that [environment] is beautiful.
“You become a leader. I am a curious person, a good observer and I like learning.
“For example, having Ronaldo close to me is interesting.
“He is like Bolt and Federer. Understanding the habits of those who have that extra gear helps.
“It is not to imitate him, but rather it helps to broaden my horizons [as captain].”
Meanwhile, Juventus sporting director Fabio Paratici has revealed the signing of Ronaldo last summer was done in a bid to motivate the squad after losing Buffon.
He told Gazzetta dello Sport: “I had a thought about [Gianluigi] Buffon leaving, the team having won seven championships, and having had a tough Champions League exit.
“So something had to be done to motivate the squad.
“I met with [chairman] Andrea [Agnelli], [vice chairman] Pavel [Nedved], and we all agreed. We must give the entire environment a shock.
“A positive shock that can project Juventus over certain limits.
“There are two ways to motivate the team. The first way? It was to buy Icardi and unleash an incredible fiasco, or we can sign Cristiano Ronaldo.”