The former Real Madrid star arrived in the summer in a club record €112m deal.
"Ronaldo was Fiat's signing. Besides, I'd already bought Cristiano Ronaldo," Moggi told Corriere dello Sport.
“He was 18 and played for Sporting CP at the time. I saw him and the next morning I signed the contract with him.
“At the time there was a real crisis at Juve. We didn't have a penny. In terms of marketing, it was an extraordinary transfer.
“However, I'd have never have signed a 33-year-old player for the figures involved and I certainly would never have paraded him before selling Higuain, someone who still guarantees you 20 League goals.
“I would've sold Higuain for €50m and only after that would I have announced Ronaldo."