The 28-year-old winger admits he still holds the Old Trafford club in his heart following a six-year stay but insists he is enjoying life in Spain and playing for Real Madrid
The 28-year-old Portugal captain has been strenuously linked with a return to Old Trafford this summer where he spent six years before moving to the Bernabeu for a world record £80 million in 2009.
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"I miss English football," said Ronaldo, speaking at a promotional event in Singapore.
"For me, it was one of the best years in my career when I was there in Manchester United. Everyone knows that it is a club that is still in my heart and I really, really miss.
"But now my life is in Spain. I am enjoying playing there too.
"Part of my life is there, but in the future we never know. I am really, really happy in the Spanish league."