You are right we shouldn't use the performance of a club in the domestic league to judge the performance in the Champions league. Sevilla has been coming up with poor performance since the beginning of this season,I think that there is a reason for this. Maybe they want to stay more focus on the Champions league,who knows ?
This was how they started last season and ended up being the champion of Europa which gave them an automatic ticket to the champions league. So let's relax and watch how their performance will be in UCL,maybe very poor or not.
At the very least, we will always see how a team performs its matches in its domestic league. only after that, at least we have an idea of how they will do in other competitions. In this case it focuses on Sevilla, they are now in the bottom position in La Liga. In their three matches, they conceded 8 goals. Of course this result is a problem, how their defense line is so easy to penetrate.
If Sevilla wants to focus on the Champions League, like you said. The scenario shouldn't be like that. At the very least, the coach will maximize his squad in preparation for their match in the Champions League by playing the best in the league competition. but what happened was the opposite, they lost in their four matches. three in La Liga, one match in the EUFA Super Cup against City. However, Mendilibar still has time to raise his team's mentality and their performance. Before competing in this competition, Sevilla must win two matches in their domestic competition for their confidence.
Talking about the match later, their opponent will be Lens. not unlike Sevilla's performance, Lens experienced a poor start to their campaign at the start of the season. Sevilla can take advantage of it, especially since the match is played at Sevilla's headquarters. well, we'll just follow it when the time comes.