Transfers
| Date | From | To | Type |
|---|---|---|---|
| 01.07.2019 | Fulham | 1899 Hoffenheim | — |
| 31.01.2019 | 1899 Hoffenheim | Fulham | Loan |
| 01.07.2017 | West Ham | 1899 Hoffenheim | € 7M |
| 01.07.2016 | Borussia Mönchengladbach | West Ham | Free |
| 01.01.2011 | Arsenal | Borussia Mönchengladbach | Free |
| 01.08.2008 | Arsenal | — | Loan |
| 01.07.2007 | — | Arsenal | € 2M |