The 29-year-old has been in majestic form this season and has scored 15 goals already, including a record-equalling 22nd Primera Division hat-trick against Athletic Bilbao last weekend.
That has sparked suggestions his former employers United could try and strike a deal for the Portugal international, who left Old Trafford for Real in an £80million transfer in 2009.
However, Ronaldo's agent appears to have quashed that speculation by insisting the player has no intention of leaving the Bernabeu.
Mendes told Spanish radio station Cadena COPE: "You will never find another player like him
He is getting better and will keep getting better until the age of 40.
"Cristiano is very happy at Real Madrid and has always been happy
He is going to break all the records there and will retire there.
"He has an affection for United because his heart was there for six years
But now all he thinks of is Real Madrid and he will always be here
"Cristiano's dream is to win another Champions League
He is never satisfied, he always wants more
He never ceases to amaze
It's impossible to find anyone like him in sporting history."
Source : PA
Source: PA