Madrid host United in the first leg of the last-16 tie later this month and Ronaldo, who spent six years at Old Trafford, was thrilled to see Los Blancos drawn against his former employers.
The 27-year-old also revealed that he was convinced that the two clubs would be paired together before the draw was made back in December.
“On the day of the draw I was out training and had this strong feeling that we were going to get Manchester United,” Ronaldo told the Sun.
“I was very happy. It’s a tough match that could go either way.
“Manchester was my home and is still in my heart. I love it because when people treat you very well, you never forget that.
“And I will never forget United, the people who work there and the supporters. So I am happy to be going back to Manchester.”