Too much speculation about Ronaldo, why he isn't a starter, the rumors said he wants not to be a starter but another rumor said is just a tactic and strategy from Allegri, I don't know which one is true. but, from this situation, we all know something happens with Ronaldo, this is not as usual, In my opinion, possible there is a conflict between player and coach.
I highly doubt that Ronaldo ever be okay with being on the bench, this is Ronaldo we are talking about and he cares about that kind of thing a lot. This must have made him feel like he is not good enough to be in the starting eleven and that is one of the most important parts, I mean we are talking about something that is demanding for a player for his caliber and that is a very important factor.Ronaldo could go to City or PSG and can still play every single game because he is THAT good and we all know it, so there is no strategy that could see him coming off bench and provide more to the team instead being on the pitch for 90 minutes which we all know he can do nearly every single game.
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Let's not forget that a similar story is happening now with another best player in the world, but only in France 
Ronaldo's obvious problem is that he can't go anywhere. Although the absolute majority of clubs in the world would like to cooperate with him with pleasure, but the high salary and tournament ambitions of Ronaldo himself will not allow this to come true. Ronaldo feels his age and the fact that his playing characteristics decrease with time, so it is understandable that he wants to make the most of his career and play at the club with the highest ambitions. 
