Looking consistent performance of Bayern Leverkusen in this season make them become high intention team for next season will appearance in Champion League has potential make unbeaten record after invisible winning Bundesliga this season. Actually drastically difference level between Europe League and Champion League although Bayern Leverkusen only got one loss in Europe League can't guarantee easily in Champion League winning every matches because get many difficult team since phase round exactly after UEFA adopting new format and each team will play 8 matches on phase group.
I can't speculate too far with Bayern Leverkusen performance in Champion League next season, although most of their old player defend and recently Xabi Alonso sign some top players but need more consistent performance when playing in higher level competition such as Champion League.
Honestly, I am expecting Bayer Leverkusen to really excel in next season's Champions League. If they can maintain the same level of performance that they have displayed this season, then next season will surely be a remarkable one for them. Given that Bayer Leverkusen has secured a spot in the Champions League next season, I believe their manager, Xabi Alonso, will be keen to sign more high-quality players to bolster the team and realize their ambitions.
However, despite their strong squad, I am not entirely convinced that Bayer Leverkusen can reach the final stage as they did in the Europa League. This is primarily because I feel that their squad lacks extensive experience in the Champions League, a competition that is fundamentally different from the Europa League. The Champions League is a stage where only the top clubs participate, making it a much more challenging arena for any team.