Lucien Favre has been presented to the media as the new head coach of Borussia Dortmund, where he signed a two-year contract in May.
Sokratis Papastathopoulos is happy to join former Dortmund team-mates Pierre-Emerick Aubameyang and Henrikh Mkhitaryan at Arsenal.
The Greece defender had been linked with Manchester United, but Sokratis Papastathopoulos has switched from Borussia Dortmund to Arsenal.
Stuttgart have signed 31-year-old midfielder Gonzalo Castro from Borussia Dortmund, while striker Daniel Ginczek has left the club.
Borussia Dortmund begin the 2018-19 Bundesliga season at home to RB Leipzig and finish the campaign with a trip to Borussia Monchengladbach.
Bayern Munich host fellow Champions League side Hoffenheim on the opening day, while Borussia Dortmund go head-to-head with RB Leipzig.
Abdou Diallo has completed his transfer from Mainz to Borussia Dortmund in a deal that will is said to be worth €28million.
South Korea and Germany face off Wednesday in a vital Group F game in Kazan, with the defending champion feeling a little wary.