Chiellini was speaking to junior Juve fans when he made the admission.
He stated, "I was a Milan fan, unfortunately, then I got better. I became smarter growing up. Maldini was my favourite player.
"I have a twin brother, he was a Juve fan and I had to go against him and be Milan. Can you imagine how happy he was when Juve bought me when I was 20 years old?
"When I moved here I immediately fell in love with the club, and now I think it's difficult to find a bigger Juve fan on this earth than me."