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The season hasn't started yet but I'd say as per my prediction that if Bayern Munich don't play according to plan then Bayer Leverkusen will have a chance to advance.
The beginning of the season is very important for every team, if the teams do not perform well in the beginning then they cannot close the points gap later on and come to the top of the points table.
You are right, Leverkusen performed brilliantly last season. We were all very surprised by such a great performance from Leverkusen. Breaking Bayern Munich's dominance and becoming Bundesliga champions was a tough task for Leverkusen. But with the help of Xabi Alonso, the Leverkusen team was able to do this difficult task. Leverkusen was 18 points ahead of Bayern Munich at the end of the season. This is an incredible gap.
However, it cannot be said for sure whether Leverkusen will play well next season. Because even though Leverkusen is the Bundesliga champion, it is still a mediocre team. There is no such star player in Leverkusen's squad. So it will be difficult for Leverkusen to dominate the Bundesliga next season. Moreover, Leverkusen will play in the Champions League next season. It is difficult to consistently perform well in every match in the Champions League and Bundesliga. Moreover, it is much more difficult to consistently perform well on a busy schedule. This is why I think it will be more difficult for Leverkusen to win the championship next season.