I definitely don't think they can win against Bayern and Galatasaray.
What is most unfortunate is when Ten Hag does not change his approach with players, which makes the club only pay their salaries without being able to get a contribution like in the case of Sancho. For me, that is detrimental to the club, because after all, an attitude like that has absolutely no benefits for the team.
Sir Alex Ferguson would also frown upon players who fail to meet up with his standards. Erik Ten Hag is stubborn and so is Jadon Sancho who has refused to apologize to the coach of Manchester United. Since he is in charge, he had to show he's Boss and in charge.
The players have to adapt, during the last days of Wayne Rooney, he complained about how Manchester United players do not take the game seriously after a defeat. They go back partying and dancing which ain't right.
Erik Ten Hag would stay as the coach of Manchester United, he won't be dismissed. Even if Erik Ten Hag fails and lose too much game, the results from last season are enough to be his spine and backing.