Six crucial Primera Division fixtures precede an encounter with a significant emotional pull for Ronaldo, as Manchester United visit the Bernabeu in the last 16 of the Champions League.
Referring to the club he left for £80million in 2009, Ronald added: "I still have great feeling of friendship and love for them, they're a team that have done a lot for my career.
"The fans know me well and I have a lot of friends there that I keep close to my heart.
"But now I am defending Real Madrid's colours. It's a bit of a sad feeling I guess, but I want to score, and for us to win, and that would make everything better."