If Barcelona wants to sell Frenki De Jong then they can take advantage of it by setting a high price. Especially if there are several teams that are very interested in bringing him in, such as Manchester United, who have actually heard the news that they are interested in De Jong for a long time, but Barcelona are keeping him. Now is an opportunity for Manchester United if they are still interested in this player, but they also have to move quickly because they are not the only ones interested in the player, there are still several big teams who are also eyeing him.
The option to sell Frenkie De Jong is an opportunity for him to immediately leave Barcelona, considering that in the hands of Hansi Flick, a player who is easily injured will sit on the bench longer. Remember, Hansi Flick really doesn't like weak players. Therefore the target with Barcelona will be to focus on stamina and playing speed. Now Frenkie De Jong can't relax at Barcelona if he continues to suffer injuries, it's possible that under the new coach I'm not sure De Jong will be used again.
The problem is, are Man United still interested in getting his signature? and Frenkie De Jong has to make sure he recovers first. The EPL is a very competitive event and there he will work even harder than at Barcelona.