The 2011 and 2017 teams had less quality compared to the 2017/2018 one, but the best mentality one can dream of. "That is the next important task or challenge we have to face. We more or less need to restructure our squad, depending on the season's outcome."

Watzke said he expects Borussia's coach Peter Stoeger and the players to invest all they need to secure the clubs season goals such as to qualify for the Champions League campaign 2018/2019.

For his part, Bayern Munich president Uli Hoeness said it is much easier for the Bavarians to deal with reluctant players than it is for Dortmund. Bayern would never tolerate a player to behave like Aubameyang, and Dembele Hoeness stressed.

"He is right about that," Watzke responded, adding that he does not wish Munich had to make a deal with a club like FC Barcelona for a Bayern player. "I am extremely curious to see what happens in that case," Watzke said.

The Dortmund official admitted the club was aware "it would never have worked with Auba in the second half of the current season." The behavior of the striker had caused too much damage and disappointment among fans and teammates. To separate was the only reasonable solution.

"That was one of the reasons why he was allowed to leave," Watzke said. After Dembele's unpleasant departure Aubameyang promised to stick to the Blacks and Yellows, "but at the same time had the feeling we owe him something as he stayed with us in 2016 despite lucrative offers while Hummels, Guendogan, and Mkhitaryan left"

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