Stuttgart has lost quite much blood in this transfer window already so far. Hiroki Ito, Waldemar Anton and Serhou Guirassy have all left for Bayern Munich and Dortmund. They couldn't sell Guirassy for a big amount because of his release clause. Ito also was sold for an amount below his market value but the Anton deal was better than both.
They have signed many CBs after that for cheap prices but let's see. More importantly, they have found their replacement for Guirassy: Ermedin Demirovic.
He had good stats in the previous season: 15 goals, 10 assists. Still not a Guirassy though.

But who knows he might also improve his performance after this signing. It was a €21m deal by the way.