Manchester united tried in the competition in Europa League and their game with Sevilla was not bad, I don't see their performance to be very bad that made Sevilla was able to eliminate them from the Europa League, Sevilla is just this lucky team when it comes to Europa league.  Manchester United perform well but their loss to Sevilla was as a a results two physical challenge of the players which made them not to be able to obtain Victory both in the first leg and second leg match with Sevilla .

Manchester United over used their players that it got to the point that they were all ready exhausted, I think this was why it was so easy for Sevilla to get advantage of Manchester United by eliminating them from the Europa League.  If Manchester United have had many players to substitute some of their player it would not have been easy for Sevilla to win Europa League. I see no reason to blame Manchester United players failing to win Europa League.
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Manchester United had good performances during this season in both Europa League and in Premier League however they were unstable and even Manchester United with Ten Hag had some bad results in this season just like the game they lost against Liverpool and Ten Hag punished his team for it.
But I think some players in Manchester United like Harry Maguire disappointed the whole team with the personal mistakes they had.
Otherwise Manchester United with Ten Hag could win the title.