Ronaldo is not a problem to Manchester United,  they don't really depend on him, so if he likes he stays or leave Manchester United won't be affected.  Manchester United are doing well in performance presently not even because of Ronaldo's. Ronaldo has only score 1 goal for Manchester United in the Europa League and has not score any goal in the premier league this season. Manchester United has other good stars who are contributing alot for the club to come out best this season.