Record claims that the five-time Ballon d'Or victor has reached this conclusion, less than two weeks after winning his third straight Champions League with Madrid, not because of money but rather status, and because of unkept promises from Real Madrid president Florentino Perez.
According to another report, Ronaldo became more unhappy after his agent Jorge Mendes met with the club on Wednesday.
After talking about his stint as a Real player in past tense, the five-time Ballon d'Or victor gave ambiguous answers when he was asked to clarify his post-match comments later in the day.
Both Ronaldo and Neymar have cut agitated figures recently and both players could move on from their respective clubs this summer.
"For me Cristiano is the best at the moment and Neymar, for sure, will be as good as Cristiano". "There's no such thing as Neymar not being there because Cristiano is there".
"The future of any Madrid player is not important, we have just made history".
There isn't a Manchester United fan on the planet who wouldn't love to see Cristiano Ronaldo line up for the Red Devils again.
The injury, which some feared may keep him out of the World Cup healed in time for him to fire past Croatia in a friendly at Anfield last weekend.
Ronaldo created a stir, minutes after La Liga giants won their third straight Champions League title in Kiev last month by hinting he would be leaving Bernabeu.
He's an artist, one of the best players in the world, a key player to help us win our matches.
United have already signed Fred and Diogo Dalot this summer and they are hoping to add Ronaldo after they finished second place behind rivals, Manchester City this season in the Premier League.