The issue of Ronaldo joining Bayern Munich is indeed being discussed, both in print and electronic media, the rumor emerged after Lewandowski revealed that his era at Bayern Munich was over and he intended to look for a new challenge to another club.
Bayern Munich sporting director also opened up about rumors of Ronaldo joining Bayern Munich, there is no potential agreement between Ronalda and Bayern Munich even though Ronaldo is a top player, he ruled out Ronaldo transfer to the Allianz Arena.
So far Bayern Munich is very careful when bringing in players, Munich is always looking for players who can improve the club game. One of the reasons Bayern Munich put such a high price on Lewandowski is because they still believe in him, Bayern will do their best to keep Lewandowski so he can keep wearing the Bayern jersey and return to the training center with other players.
It's just a rumor that Ronaldo will join Bayern Munich because I don't see any reason Ronaldo need to leave Manchester United, he already got paid with huge payroll and no intention to join Bayern Munich. This is different with Lewandowski he want to join Barcelona and had a personal agreement, but Bayern Munich won't want to let Lewandowski leave easily, they demand a huge money. But Barcelona couldn't able to reach Bayern Munich offer, perhaps Barcelona may offer a loan until they earn sufficient money to buy Lewandowski.
Also Bayern Munich will have Sadio Mane that will replace Lewandowski if it's happen.