Felix is having a hard time at Atletico Madrid, I don't know if the coach and the player are having issues because I don't see that connections between the coach and the player for him to start and he's not happy. Ever since he got back from the EPL on loan to Chelsea, he hasn't been the same player he was when he left on loan.
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I don't think Joa Felix is a great footballer, but it's not easy to adapt to Diego Simeone's game plan. For an offensive footballer, working with Diego Simeone must be a nightmare. In fact, Joa Felix had the chance to get away from Diego Simeone by playing for Chelsea in the second half of last season, but he didn't perform impressively at Chelsea and returned to Atletico Madrid. If he had done a bit better in the Premier League, I think he would have been a bit more likely to move to another team this season.