"It was like my second family there too so I'll not forget that the people treat me good. I'll not forget, so I appreciate a lot.
"I love Manchester, to be back, I never know, you never know, football you never know.
"I appreciate this club, for me it's one of the best clubs in the world and I have passion for this club.
"Of course I'm happy at Real Madrid, it's my home, it's my club but Manchester treat me unbelievable so we never know."
The Portuguese star also offered his best wishes to United as they enter a new era under Dutch coach Louis van Gaal.
Ronaldo believes that the former Netherlands boss has what it takes to restore United to their former glories, and reserved words for Sir Alex Ferguson, the man who brought him to England from Sporting Lisbon in 2003.