Transfers
| Date | From | To | Type |
|---|---|---|---|
| 01.01.2020 | Lask Linz | — | — |
| 01.07.2017 | Union Berlin | Lask Linz | Free |
| 05.01.2016 | — | Union Berlin | Free |
| 03.07.2013 | VfL Wolfsburg | — | Free |
| 01.07.2013 | West Ham | VfL Wolfsburg | — |
| 28.01.2013 | VfL Wolfsburg | West Ham | Loan |
| 01.07.2012 | — | VfL Wolfsburg | € 2.3M |
| 01.08.2005 | Bayer Leverkusen | — | € 2.7M |
| 01.03.2005 | Bayer Leverkusen | Spartak Moscow | Loan |
| 01.07.2003 | Bayer Leverkusen | Grazer AK | Loan |
| 01.08.2002 | Bayer Leverkusen | — | Loan |
| 01.07.2001 | — | Bayer Leverkusen | € 400K |