Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 03/2019 |  | Moody Chana | DF |  | TSG Hoffenheim II | Hoffenheim II |
| 01/2019 |  | Lucas Ribeiro | DF |  | Vitória - BA | EC Vitória |
| 01/2019 |  | Christoph Baumgartner | MF | | TSG Hoffenheim II | Hoffenheim II |
| 01/2019 | | Yannic Hess | G-AN |  | TSG Hoffenheim U15 | U15 |
| 08/2018 |  | Reiss Nelson | FW |  | Arsenal FC U21 | Arsenal FC U21 |
| 07/2018 |  | Kasim Adams | DF |  | BSC Young Boys | Young Boys |
| 07/2018 |  | Alfons Amade | DF | | TSG Hoffenheim II | Hoffenheim II |
| 07/2018 |  | Joshua Brenet | DF |  | PSV Eindhoven | PSV Eindhoven |
| 07/2018 | | Leonardo Bittencourt | MF |  | 1. FC Köln | Köln |
| 07/2018 |  | Vincenzo Grifo | MF |  | Bor. Mönchengladbach | M'gladbach |
| 07/2018 | | Philipp Ochs | MF |  | VfL Bochum | Bochum |
| 07/2018 |  | Ishak Belfodil | FW |  | Werder Bremen | Werder |
| 07/2018 | | Felipe Pires | FW |  | Austria Wien | Austria Wien |
| 07/2018 | | Joelinton | FW |  | Rapid Vienna | Rapid Vienna |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2019 |  | Håvard Nordtveit | MF |  | Fulham FC | Fulham |
| 01/2019 |  | Justin Hoogma | DF |  | FC St. Pauli | St. Pauli |
| 01/2019 |  | Steven Zuber | MF |  | VfB Stuttgart | Stuttgart |
| 01/2019 | | Vincenzo Grifo | MF |  | SC Freiburg | Freiburg |
| 01/2019 | | Gregor Kobel | GK |  | FC Augsburg | Augsburg |
| 01/2019 |  | Kevin Akpoguma | DF |  | Hannover 96 | Hannover |
| 01/2019 | | Felipe Pires | FW |  | Palmeiras | Palmeiras |
| 08/2018 | | Robert Žulj | MF |  | 1. FC Union Berlin | Union Berlin |
| 08/2018 | | Philipp Ochs | MF |  | Aalborg BK | Aalborg BK |
| 07/2018 | | Alexander Rossipal | DF |  | SV Sandhausen | Sandhausen |
| 07/2018 | | Felix Passlack | MF |  | Borussia Dortmund | Dortmund |
| 07/2018 | | Maximilian Waack | MF |  | Austria Lustenau | A. Lustenau |
| 07/2018 | | Serge Gnabry | FW |  | Bayern Munich | Bayern Munich |
| 07/2018 | | Meris Skenderović | FW | | TSG Hoffenheim II | Hoffenheim II |
| 07/2018 | | Mark Uth | FW |  | FC Schalke 04 | Schalke |