The Portuguese forward left United for Real Madrid in a world-record £80million deal in 2009.
When asked about a move back to England, the highly-rated forward told Sky Sports News: “Maybe in the future I hope so, because I know the league, I know the players, I know the atmosphere.
“I have good memories from Manchester and when I watch sometimes the games I miss it a lot because it’s part of me I left in England.
“The most important reason why I moved is the challenge because I really like to put myself under pressure to see what I can do, but I really miss the Premier League – for me it is along with the Spanish league the best league in the world.”
“Just because I play in Madrid I’m not going to miss speaking with the old guys so, when I have an opportunity, I speak with Sir Alex Ferguson,” he added.
“It was important for me when I played there, when my life was there, so it is good to speak with him because I’ll never forget who really helped me.”
But Ronaldo insists he has no plans to leave Real Madrid in the near future.
“I am very, very happy in Madrid,” said Ronaldo.
“I’ve said a few times that, if Madrid want, I can sign for ten years more until the finish of my career but nobody knows the future.”
