According to Goal.com, if the position of the Mancunians does not change in the near future, the striker will leave the club.
He has already discussed a possible withdrawal at the end of the season with his agent Jorge Mendes.
Ronaldo has taken part in 16 Premier League games this season, scoring eight goals and making three assists.
Earlier it was reported that Ronaldo will leave Manchester United if he is not satisfied with the choice of a new head coach.