The Portugal international has been linked with a move away from his current club more than once, but has insisted he is happy at the Santiago Bernabeu.
"Manchester United are a club that has been in my heart since I was there, everyone knows that I have passion with that club. But my future now is with Real Madrid and I want to be there," Ronaldo told reporters.
The Portugal international stated earlier this week he still has warm feelings for the English champions and misses his time in England, but has now made it clear a return to Old Trafford is not an option for him at this stage of his career.
"It is not the day to speak about my future. I am going to have time to do that before the preseason. Basically it is now time to rest after 10 months of a long season. I enjoy playing there, I have been playing in Spain for four years so I want to continue there," Ronaldo stated.
He added, "For my national team, I hope that we can qualify for the World Cup - it will be a big goal for us - so we are focused on that and I am looking forward to being in the World Cup.
"Of course, I always look forward to getting better and better throughout the season and this year is going to be the same. I will try to be focused all the time, to win La Liga and to win the Champions League like we always do."
The 28-year-old has scored an incredible 201 goals in 199 appearances in all competitions for Madrid since joining the club in the summer of 2009. Ronaldo has a contract with los Blancos until 2015.