Sevilla will fly to Old Trafford in the first leg of the European league, obviously they will not be counted as favorites considering they will be a visiting team and their opponent, namely Man United, is one of the favorites to win, if Sevilla still wants to stay in the European league by being able to semifinals then they should be able to play well in the first leg to make the result draw or if they lose not by many goals and that will still open up their opportunities in the second leg, but it looks like Man United will take this opportunity as an advantage to make lots of goals and play more safe when they have to go to Seville's home.
A Sevilla team should not be underestimated on the Europa League platform. Sevilla won the Europa League title 6 times. So even though this group is relatively weak, they cannot be underestimated. I saw their performance against it at Fenerbahçe. The team's attack is very weak. Even then they won against it at Fenerbahçe. And my guess is that in the away match against Manchester United, they will play completely defensively and try to draw the match. If the away match is a draw then I guess Sevilla will qualify for the next round.