What Joao Felix has done so far has also made Barcelona happy and Barcelona's decision to respond well to his desire to play at this club has at least paid off, with the very little money they have spent in the transfer market and with what is currently being shown it is quite profitable for Barcelona, and the next thing is how they patented Joao Felix as a full Barcelona player.
Joao brothers aka Felix and Cancelo looks really different when they were playing in their old teams and when they play for Barcelona, I expect Barcelona will sign both of them permanently. Barcelona need to prepare at least 200 Million Euros because Atletico Madrid tend to ask ridiculous amount.
I couldn't believe my eyes that guy once played for Chelsea, his ball control in the last match he played in the Champions League was above what I expected for a starter that has bad days in his previous club but he picked interest in Barcelona with pride or probably it was because he had it in his mind to be at Barcelona one day. Felix having two goal in his first appearance and Man of the match is incredible, it's like having Bellingham in Real Madrid but he has less appearance for now, time will tel if he is going to continue to shine like this in the coming weeks and months as the leagues continue.
I don't think Barcelona is going to buy Felix, the reason is that in his current contract, there was not option for buy clause which means that Barcelona cannot buy him untill this contract expire and they wish to buy him, they have to come to agreement on a new terms to finalize how much they wish to buy him and that is if Atletico Madrid agree to sell, if they don't want to sell, Barcelona will not have him unless they want to use money to convince the parent team.