The Special One dismissed suggestions that Cristiano Ronaldo would quit Real to join City because the Blues don't have the right kind of pedigree.
But Mancini has hit back by claiming that City will become one of the biggest names in football inside the next decade.
"Wait for the next 10 or 20 years. OK, we can't win like Real Madrid because they have been winning for 50 years, but we are winning things now and we want to continue that if it is possible. In the next 10 years I think Manchester City will become a top team like Real Madrid.
"Yes, they have a bigger history so there is a difference, but we'll see."