How is it possible? barcelona is still in the financial trouble. Even if the club will put some young players for sale and it will not enough since barcelona is still having unpaid debt. Barcelona is likely able to buying the cheap striker from another club.
I don't believe if barcelona will able to get lots of money to buy the new players again. Im thiking that if barcelona will find difficult to do that as barcelona has obligation to pay the money owe by the club from other club.
Barcelona is still having a lot of unsolved problems.
That is why I mentioned that optionally they could go for one or two players on loan contracts if they see some good fits but can't mobilize the financial resources to buy that player. But usually when a club wants to get rid of a player during the winter transfer window, there are also reasons behind those decisions. They can cross of those players from their payroll and get a transfer fee. It depends on negotiations and all circumstances but sometimes it can make sense to compensate for situations like the one that Barcelona is now dealing with because of Gavi.