Sevilla is not a strong team at all and they had a poor performance during this season, in a normal situation against Manchester United, Sevilla had no luck winning this game because just because of the mistakes of some players in Manchester United and especially defenders they lose this game, otherwise Macnshter easily win.
Actually, I still feel they are a strong club, it's just that this season they haven't done what he should have shown because in terms of strength and statistics the last few seasons they are still a very strong team.
Now their focus is on the Europa League so they will devote all their strength here considering that La Liga has no hope for them in pursuing positions and playing in international matches next season of course this will be another consideration to continue to focus and maintain hope for them.