That's according to Spanish expert Guillem Balague.
Balague tweeted: "Manchester United have considered the departure of #CR7 for a while, Ragnick thought getting rid of him was essential for the good of the team.
"But only one club really interested but can't adjust the numbers.
"[Diego]Simeone wants him at Atletico to do a Luis Suarez with him. And CR7 likes the idea and might explain his behaviour
"Atletico looking at all kinds of possibilities to please Simeone and Jorge Mendes who has an exceptional relationship with the decision makers at the club"