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That's because Barcelona is in need of fresh funds. If they succeed in persuading De Jong to be willing to join Man United, then in addition to getting fresh funds, Barcelona can also reduce their expenses, which means it's a solution for Barcelona to register their new players.
Barca's finances are not good. therefore to bring in new players they also have to sell some of their players who are interested in other clubs and are not included in Xavi's plans.
De Jong is reportedly reluctant to leave Barca. even though Barca is waiting for De Jong's decision before bringing in new players. Barca did not dare to bring in new players at once, it was because their finances were still not recovering. because some have already arrived, of course, some will have to leave the team.
De Jong is the only player who did not agree to take a 50% pay cut if I am not wrong. And I still don’t think that he has agreed to that even though he said he wants to play for Barcelona. Barcelona is obviously not in a position right now to offer large salaries to any player.
But at the same time, we also need to think about Barcelona bringing in new players and spending almost ~€150 million on the transfer market. So for some reason, things don’t add up. And it would be hypocritical to say that Barcelona is not serious about keeping De Jong on the team just because of the salary, when they are spending so much on new players.