For Manchester United to knock Barcelona out from the Europa League I know they are fit of winning the europa league. Manchester United are with the best squad, players like Rashford and Casemiro always play a good role in every for Manchester United, Rashford is goal scoring machine for Manchester United.
The two players you mentioned were indeed very good players at Manchester United, but there was one player named Bruno Fernandes who sometimes really didn't get along with them at Manchester United because Bruno often made the mistake of not giving feedback to his friends when there was an opportunity so he very often want to score goals alone that sometimes the opportunity becomes very futile. And I think if he can change the way he plays at Manchester United and can mix his game with Rashford and Casemiro, Manchester United will be much stronger than they are now.
If so, then perhaps it can be assumed that Bruno Fernandes is playing with high selfishness, because if Bruno Fernandes can play not for selfish reasons then of course Bruno Fernandes will be able to assist colleagues who are in a better position to score goals. Cases like this would indeed be very unfortunate, because as a team, of course, every player should be able to trust their teammates.
But yes, apart from this case basically in this season Manchester United managed to improve their performance under the coach of Erik ten Hag. So yes, it is clear that Manchester United have managed to sign the right coach and with a good improvement in his first season, then Manchester United is expected to win trophies too in this Europa League.