A total of 11 players left the club over the summer transfer period, most notably Cha Du-ri and Mohamadou Idrissou, who join Celtic and Borussia Mönchengladbach respectively after their contracts had expired.

Incoming to the club were Jan Rosenthal from Hannover 96, Maximilian Nicu from Hertha BSC and Zvonko Pamić on loan from Bayer Leverkusen.

Towards the end of the summer transfer period, the club made multiple further additions by bringing in Kisho Yano and Anton Putsila.

Win Tie Loss (League only) Papiss Cissé Jan Rosenthal Stefan Reisinger Julian Schuster Johannes Flum Oliver Barth Heiko Butscher Edson Braafheid (Bayern Munich) Mats Hummels (Borussia Dortmund) Adam Nemec (1.

FC Kaiserslautern) Mensur Mujdža (vs. Borussia Dortmund) Felix Bastians Maximilian Nicu Stefan Reisinger Cédric Makiadi Julian Schuster Heiko Butscher Daniel Caligiuri Anton Putsila Oliver Barth Oliver Baumann Papiss Cissé Jonathan Jäger Erik Jendrišek Kisho Yano (League only) Papiss Cissé Mensur Mujdža Anton Putsila Yacine Abdessadki Oliver Barth Heiko Butscher Julian Schuster Daniel Caligiuri Stefan Reisinger Ömer Toprak Felix Bastians Johannes Flum Cédric Makiadi Simon Pouplin Jan Rosenthal Ivica Banović (vs. Schalke 04) Pavel Krmaš (vs. 1899 Hoffenheim) Ömer Toprak (vs. Borussia Mönchengladbach)