Real Madrid star Ronaldo: Man Utd best time of my career
Nine trophies at home and abroad compared to just three domestic gongs in Spain so far.
He told The Sun: "Yes Manchester was a very good cycle for me.
"I won everything there. It was a fantastic part of my life there.
"And maybe it was the time I enjoyed my football the most because I was so young.
"To be at Manchester United - one of the biggest clubs in the world - at just 18! It was a dream!
"And to play alongside those players you had only seen before on television - maybe that's why I feel I enjoyed it there the most."