The Portugese will complete a sensational return to Old Trafford after United agreed terms with the Serie A giants on Friday evening.
Ronaldo spent three years with the Italian club, where he racked up 101 goals while also helping the side win two Serie A titles, two Italian Super Cups and one Coppa Italia title.
The Portugese took to social media to bid farewell to the Serie A giants ahead of his return to Manchester.
"Today I depart from an amazing club, the biggest in Italy and surely one of the biggest in all of Europe. I gave my heart and soul for Juventus and I'll always love the city of Turin until my final days.
"The "tiffosi bianconeri" always respected me and I tried to thank that respect by fighting for them in every game, every season, every competition. In the end, we can all look back and realize that we achieved great things, not all that we wanted, but still, we wrote a pretty beautiful story together.
"Juve, storia di un grande amore
Bianco che abbraccia il nero
Coro che si alza davvero
Juve per sempre sara…"
"I will always be one of you. You are now part of my history, as I feel that I'm part of yours. Italy, Juve, Turin, tiffosi bianconeri, you'll always be in my heart."
