De Jong is not the only good player in the world bro. De Jong's issue even has the undertone of substantial salaries owed him by Barca,don't you know that? So he's not even a proper example to use.
United still has enough accolade to attract players,a decent striker just signed for Westham. Players are coming to Barca for less and to earn lower salaries, not just because of the Champions League(eg Chelsea was to offer Raphinha CL football),but the accolade. Roma signed a Dybala.
It all depends on the club hierarchy, there are good players willing to come.
Cheers
Then Manchester United should stop disturbing him and go for other good players. The ex Barcelona president ; Maria Batomeu or what's his name cause this problem for Frenckie De Jong and Barcelona, even Messi contribution to it because he demand Barcelona to bring him to the club