It seems that Joao Felix's return to Atletico Madrid did not make him Happy. It seems that he still can't get in touch with Diego Simeone. With these bad rumors, Joao Felix has been linked with many clubs wanting him. I think Joao Felix is a good player, at Chelsea he was not at his maximum because of the coach. There is news Barcelona and Man United are interested in Atletico's most expensive player. Of course they can take advantage of this bad moment to get Joao Felix.
I don't understand exactly what kind of situation happened between Felix and Simeone, why the situation seems to say that the relationship between the two is not okay. If that really happened then I think it's natural to make Felix's situation uncomfortable at Atletico Madrid, because even though Simeone is a professional coach, I will not deny that maybe the opportunities that will be given to Felix will not be much. If the situation is like this then Felix should look for a new club that is ready to buy him, because in the game he looks good and has value for him to sell.
But I also think this is a situation that has been exaggerated by the media, or something else. It's quite unfortunate when a potential young player like him gets into a difficult situation like this.
Manchester United are rumored to be interested in this young player, but I don't see any serious movement from them, this is just a rumor that has no confirmation at all.