Ferdinand said last week how he had constantly called the 28-year-old in order to try and persuade him to swap Madrid for Manchester, and the forward confirmed as much on Monday.
Ronaldo said: "It was true that Rio spoke to me a lot. Rio is a great friend of mine, we played many years together at Manchester United and we were neighbours when I was there in Manchester.
"He's a fantastic guy and tried to change my mind. I did think about United. They are still in my heart. It's a club where I played for six years and I love that club. I have a lot of friends there and I wish them the best."
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