The fact that Bayern Leverkusen were undefeated until the final of the competition shows that they are very strong. However, a team that competes for a full season and is still beaten till the final is not a weak team, and that doesn’t mean they won’t perform as we are saying in the champions league.
I believe they can do it even in the champions league competition, even if they will perform the same as they are doing in the Bundesliga, because I know the Champions League has many more strong teams than the Bundesliga that Leverkusen have already used to, so the thing here is that Leverkusen will not be beaten in the champions league, but with their current status of performance, I believe even if they don't top the table, they will nearly make it to the top.
Yes that is right Bayern Leverkusen long undefeated streak shows how strong and determined they are. Even though they lost in final but it is clear that they are good team. And exactly hey can play well against tough opponents and have good chance of doing well in Champions League. Champions League has many strong teams but Leverkusen has already shown they can compete with the best in the Bundesliga. They might not win first place but I think they'll come close and do well in the competition. Their team work can help to stand against the tough teams and they already showed it.
Real Madrid is a very good team and favorites for the UCL next year. He had a dream season for Bayer Leverkusen last year. Their only defeat was in the final. This happens too, of course. They suffered only 1 defeat in a whole season and this was the final match. Their luck did not change against Atalanta. They are one of the strong candidates for the UCL next year, but to be honest, I don't think they will compete with a team like Real Madrid.