Ten Hag must win the dressing room because everything starts from there. Some of Manchester United's senior players look selfish in the game and actually this should be resolved rather than bringing in lots of new players. I agree that there are certainly some players who come and go, but improving the performance of existing players must be the focus at this time.
But the problem is that even if there was a thorough discussion in the dressing room and maybe it could fix everything, I see it as nothing more than a formality. After being on the field, these players will definitely forget what was discussed previously and in my opinion, even if Manchester United still has players who are as selfish as before, then they will not really be able to solve the problem and the team must be willing to continue to be at a disadvantage.