Sevilla are the kings of the Europa League so they ought to provide Manchester United with their biggest test in the competition so far this season. But the club, who have lifted the trophy six times, have had a catastrophic season.
They finished fourth last season, this campaign there have been times when they would have taken fourth from bottom such was the real danger of relegation.
The first mistake was not to part company with Julen Lopetegui in the summer.
Both sides knew a very successful three-year spell had ended and hiring a new coach before the season began might have meant for a more cohesive start.