Many people are just using Juventus performance In the Italian league to predict how their game be in Europa League. Juventus had serious challenge in their performance in Italian League in the early time of the season. I still have confidence in Juventus to perform well in their games here in Europa League.
You can even googling it easily and it will give you head to head between juventus vs sevilla. People are picking the team based on their analysis. it's not caused by how good or bad juventus in the domestic league.
There are so many reasons why people are picking it. I think that you can also try to do your own research before trying to think if anyone only used performance from the domestic league as their benchmark.
That is really wrong. Juventus had bad result in the latest match against napoli. The trend may be able toc hange anytime.
You shall try to browse head to head between these clubs.