Sometimes i don't know where Barcelona is going with their transfer business, i don't know if they were actually keen on keeping both Cancelo and Felix and just didn't have the money to do so, or if they only planned to keep them in Barcelona on loan for last season.
Barcelona may have no idea about transfer business. They are in a crisis of financial, they look unable to sign any player. I don't think Barcelona will sign Cancelo and Felix, they only want to get them as loaned players again if Man City and Atletico Madrid agree. But there is no guarantee that Man City and Atletico Madrid will let them to join Barcelona anymore. I see Man City and Atletico Madrid may need more players in each position for the next season because UCL will have more matches. So, they probably keep them in their squads.
City and Atletico Madrid would want to get rid of both Cancelo and Felix, but it might prove to be difficult because of the cost of transfer and wages, and i'd not be surprised if they both go out on loan again.
Man City and Atletico Madrid may have the intention to put the players on the transfer list. However, I doubt if they will agree with cheap transfer fees. If Barcelona wants to sign them with cheap transfer fees, I think Barcelona won't have a chance because there should be many other teams interested in Cancelo and Felix.