Cristiano Ronaldo admits he misses Manchester United, but has ruled out a return to the club he left for Real Madrid for now.Although the forward, who has two years remaining on his contract, has been linked with a move to United and the champions would be keen to resign him, Ronaldo says he is happy in Spain.“I miss English football,” he said. “For me, it was [some] 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.”The 28-year-old did not, however, rule out a move back to United. “Part of my life is there, but in the future we never know. I am really, really happy in the Spanish league.”