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Sevilla's current Laliga form is not encouraging, and this may have an impact on their Champions League performance because teams like Arsenal and PSV are playing very well in their respective leagues, with only Sevilla and Lens having poor starts to their respective league seasons; as a result, I predict Arsenal and PSV to qualify to the round of 16 ahead of Lens and Sevilla.
I don't imagine that Sevilla performed so badly in La Liga earlier this season, but there is a possibility that they can do better in the Champions League to win a place in the last 16. Sevilla are a different team in the Champions League so we shouldn't underestimate them just because of their poor form in La Liga.
In my opinion, Sevilla still has a chance even though Arsenal and PSV are able to perform well in their respective domestic leagues. Even though it can be used as a benchmark for analyzing the possibilities, I am sure that Sevilla will look different in the Champions League.
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.
It would be a very wrong strategy to ignore the league in order to focus on the champions league if they think so. Sevilla is an important team and yes, there is an important expectation from them as the last European league champions. I hope they do well in UCL but I don't think they will do well there if they don't perform better than they did in the league.