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.
Atletico Madrid is a club that to be used mainly for business, they're not want to achieve anything and only try to find a potential cheap player, then sell at high price. Barcelona don't have a good financial, it's impossible they would sign Joao Felix. I think he will join in one of EPL club again, maybe Newcastle United, Tottenham Hotspur, Manchester United, those clubs are have a high possibility.
Tottenham may want to sign Joao Felix if they sell Harry Kane. We also know that Newcastle United is still aiming to build a strong roster for UCL. They might want to sign Felix too. I think he's more likely to go to Premier League teams now.