Duo Joao is a player who has made a positive contribution despite his loan status, both players have done their job very well. This is because Joao Felix and Cancelo realize that this is the only way they can continue playing on the field with enough playing time. At his home club there is no guarantee that he will get regular playing time like at Barcelona. In my opinion, if Felix or Cancelo return to their original club, they will fill the bench again or loan.
In my opinion, these two players are actually still far from Barcelona's expectations, but after all they have done their best and I doubt that Barcelona will borrow them again, let alone make them permanent because Barcelona has not been able to escape financial problems.
So I think Barcelona will try to borrow other players or look for players. who has free transfer status to bring him to the club and hopes that the player can give more positive results, but I don't think it's easy for the club because Barcelona's current condition will make the players think long and hard about playing with the club, even though Barcelona is an elite club in La Liga. .
Regarding the fate of these two players, it looks like they will be returned to their respective clubs.
I think Barcelona has enough cooperation with them and it looks like these two players will again sit on the bench or if a club makes an offer to them. I think the club will easily let them go because they are not really used in their respective clubs.
Yes, you are actually right about this two players, they are less important to their respective club and if you look at them again, though they are top quality for Barcelona football club, but to Atletico madrid and Manchester city they are not up to the required standard needed to be playing regularly week in week out.
And talking about the ability of Barcelona retaining their services, just as you rightfully said, financially it's very much unlikely that they can sign them on a permanent basis due to financial troubles, and I also don't think Manchester city and atletico madrid would want a loan deal again, they might prefer a straight forward sale, than sending them out on loan again, now that their value is still high.
Lastly, I am still really surprised by the financial status of a world class club like Barcelona, how do they even got to this point? Their are so many questions that need an answer from the hierarchy of Barcelona or even the past administrators, because it's no longer funny.
Poll
