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As far as I've heard from the media, Hummels also no longer wanted to stay at Dortmund. There were apparently problems between Terzic and Hummels, but at 35 he probably wouldn't be able to be in the starting eleven.
Nuri Sahin is now taking over the head coach position instead of Terzic, which will also be a big challenge for him. They need to make a few good transfers this summer, because Reus and Hummels were important players who are no longer there.
Bringing in some additional players is something Bayern can't afford to miss out and this is because they really need the adjustment as the German bundesLiga is no longer a league made for Bayern Munich, a lot of teams have started gearing up and making the league a lot more interesting and I would definitely love to see what the likes of Bayern lavekusen and also Dortmund have installed ahead of the new league.
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.