But, Ten Hag only have a year to build Manchester United, I don't think he can. If Manchester United didn't qualify for Champions League in the next season, I'm 100% believe they will sack Ten Hag ASAP. And then, the problem can't be resolved since the team always change the team for every one or two years.
The best solution is to sign Pep Guardiola or Ancelotti, because if they failed to bring Manchester United glory, the fans will blame the players instead of the managers, so they can survive and build Manchester United for many seasons.
The situation on Manchester United is different from that of Chelsea. Since Ten Hag might be getting pressure from the management also he would already be looking for ways to improve and see if there will be a way even to get another trophy in their possession because that is one of the reasons Chelsea sacked their coach they want trophies. and if its about qualifying for the champions league then their is still a lot of work for Ten Hag to do , if he wants to archive is goal of given Manchester united victory. and even if he does not qualify for the champions league what if they don't sack they might just want to give him another chance.
Any decision will be for the interest of the club because a situation were the cub is not performing well then the way forward is to bring solution to what ever problem it might be, why will they sigh pep when we are renewing our contracts with him because that dude is one of the best coaches have seen so smart and knows how to make use of experiences, who do you expect the fans to blame if not the players because they are the one performing on pitch the coach can only train but the players might decide not to work together or even create more challenges for the coach, their is nothing much to worry about.