Atalanta did very well in the last Europa league competition for sure but champions league? It's a completely different ball game entirely. Compared to the UCL, I would say the Europa is alot easier to scale through the stages. The UCL on the other hand, you're more likely to lose out at any stage of the competition because the stakes and very high and almost all teams there are top tier teams — at your level or above it. As much as I'd love to see an underdog like Atalanta or Leipzig to win, I don't think we'll get it in the upcoming season.
Amongst all the teams that will be playing in the champions league next season, Atlanta happens to be one which my expectations of them aren't at any point so much because they won the Europa for me isn't enough reason to believe they are going to be superb at the champions league, even in the Europa, they were playing like they were literally just trying their luck until they got their first biggest breakthrough in winning Liverpool, then they believed they can be able to attempt the league title and fortunately for them they won it so I'm believe there will still be a bit of that doubt in them at the champions league too.