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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.
like I always say in my opinion, aside from football being a sport to entertain money to has to be considered business is business and I don't think Atlantico Madrid performs that badly in La Liga maybe since they don't have any good competitors there the only dominant clubs are Barcelona and Real Madrid, So even if they are not carrying trophies since they are making money is not that bad. Joao Felix is still very young, only 23 years old, and I think he should just return to EPL clubs. It will even improve his performance, in my opinion, if you want to get better then you go to EPL clubs. there are good chances of you getting better there.