Cardoso Varela is a good option for them because he recently had a bad relationship with his team and tried to leave Porto, which shows that he was interested in leaving Porto. Barcelona was a fantastic destination for this young player.
It will be very good if Barcelona goes outside and signs young players like the way Real Madrid did and signs Vini Jr, Bellingham, Rodrygo, Camavinga, Valverde and all these key players they have today, Real Madrid invests in young players that they believe their future will be Bright, Real Madrid invest and they are enjoying it today because as the old players of Real Madrid are retiring the young players continue to represent them by continue winning trophies.
Barcelona keeps saying that they don't have and that even makes things difficult for them, about signing this player I don't think Barcelona can sign the player because even if Barcelona signs the player he can't move to the first team because Barcelona can not register some players, there are some news that Barcelona have not register Dani Olmo till now because they don't have money, Barcelona is also trying to sell some players to get more to buy and register some players, I don't even know if Barcelona has a good president.