Everyone knows how important Xabi's role was in turning Leverkusen's game into a very strong one. I think they are very ready for a competition as big as the Champions League. and they will be able to compete with other strong European teams.
they prepare better, I'm sure they won't end up like Napoli last season. where they won Serie A but then they had great difficulty competing with other teams both in Serie A and in the Champions League.
Bayer Leverkusen and Napoli are of course very different because the teams are coached by different people so Xabi Alonso's role at Bayer Leverkusen cannot be compared to the role of other coaches in other teams. I also think that Bayer Leverkusen is very ready to undergo next season which is full of even greater competition than this season because Bayer Leverkusen fans also really want to see the team they support again be able to win again in the Bundesliga and be able to go further in the Champions League.