Leverkusen only needs a few touches in the transfer window to add depth to the squad, while Dortmund seems to need to move more actively because they are missing several key players. Marco Reus and Mats Hummels will reportedly leave Signal Iduna Park, management must immediately find replacements for these two players next summer. The competition for the Bundesliga trophy next season will be even more difficult, the breaking of Bayern Munich dominance indicates that competition in the Bundesliga is increasingly competitive. Leverkusen will be the top favorite team, followed by Bayern Munich and Dortmund, and Stuttgart and Leipzig after that. The change in managers for Bayern Munich and Dortmund made it easier for Xabi Alonso to lead Leverkusen to success again, but Leverkusen seems to be having difficulty repeating the historic record they achieved last season.
I think Leverkusen only needs few new players to strengthen their team but Dortmund needs to make bigger changes after losing important players like Marco Reus and Mats Hummels. With Bundesliga getting more competitive Dortmund must quickly find new players to replace them. Leverkusen has good chance to win title because of Bayern Munich changes and Dortmund rebuild. But it won't be easy for Leverkusen to repeat their success from last season even with Xabi Alonso leading team. They need to play consistently well and build momentum to stay ahead of other strong teams like Bayern Munich, Dortmund, Stuttgart and Leipzig. It is going to be an exciting season.