I have not yet seen any rumors that Cristiano Ronaldo is interested in going to Bayern Munich. He joined Manchester United last season. It doesn't seem credible to me that he will leave United this season. However, if Ronaldo comes to Bayern Munich, I don't think he will be able to get along well with Lewandowski. Lewandowski has long been one of Bayern Munich's most important players. He certainly does not want to lose his position.
Actually this is just an exaggerated issue because even if you look at the statement from Bayern they even say that they have no intention of bringing Ronaldo to the Alianz Arena on the other hand Ronaldo has no plans like him to leave United.
I think this is only an issue that has made it exciting for transfers this season.