Sevilla have seemed to be a scary giant if they play in Europa League, while they always struggle in Champions League. It feels so strange when they even failed UCL group stage, even finished at the bottom. It sounds like an anecdote to say Europa League contestants should be grateful because Sevilla did not appear. Their absence opens up opportunities for other teams to shine, even though there are teams have past success in the tournament.
Sevilla squad is no longer the same as the previous squad. They was a strong team when some key players were still in the team. In the last transfer windows, some of the key players decided to leave Sevilla. Sadly, Sevilla failed to get proper players for the replacement. The current Sevilla squad is not strong enough, that's they fail to survive in UCL. They finished the group stage in the bottom position, so they also failed to go to Europa League knockout phase.