PedroMendez
Acolyte
There's no way that Dortmund will sell Reus to us now that he has a longterm contract and no release clause. I doubt he'll leave at all this summer, but if he does, I'm 100% certain that his destination won't be Bayern. I also doubt we're stupid enough to pay big money for him now, if he could have left on the cheap a few months ago. He made his bed by signing a new contract.
We also aren't weak at centerback at all. Boateng has been fantastic for years now, Badstuber looked excellent this season, actually a lot better than Hummels. Benatia hasn't been fit once this season, but obviously is a top class centerback and we've played with Martinez and Alaba at centerback as well, both did really well. I don't think Hummels wants to return to us anyway, but I also think we're not the slightest bit interested in signing Hummels. Even if Dante leaves, I doubt we'll add a new centerback to the team.
Gündogan however is certainly possible. Schweinsteiger's and Alonso's contracts run out next year and it would make a lot of sense to add at least one more central midfielder to the team. His contract situation also helps a lot. If we convince Gündogan to join us, Dortmund again face the dilemma of selling to us this summer or letting him leave on a free next summer.
/edit:
I totally forgot that we signed Joshua Kimmich already. Unless Pep really turns him into a rightback, we don't need Gündogan. Alonso, Schweinsteiger, Lahm, Thiago, Martinez, Alaba, Rode, Kimmich really should be more than enough central midfielders going forward. It has a nice balance between young talents and experienced players as well.
Gündogan + a sneaky bid for Isco would be