Selling the players they currently have when their performance is declining will be a big loss for Manchester United, because the value of their players will also decrease. But keeping them is also not the right solution, Man United clearly needs a refresh in their squad. So whether they like it or not, Man United must sell their players at a loss and spend their money again to be able to recruit new players who are more promising.
in this case Manchester United may have some appropriate reasons when selling their players, or there are criteria that are not yet satisfactory among their players including the incompatibility of their coach and that can also be a reason when selling their players. even though the performance of their players is still good sometimes this can be done because it is considered that there are differences in many things, even though Manchester United's performance has decreased by selling their players but I think they are doing the best policy they take.