Transfers
| Date | From | To | Type |
|---|---|---|---|
| 25.01.2021 | Arsenal | Olympiakos Piraeus | Free |
| 02.07.2018 | Borussia Dortmund | Arsenal | — |
| 01.07.2013 | Werder Bremen | Borussia Dortmund | € 9.5M |
| 01.07.2012 | Genoa | Werder Bremen | € 4.5M |
| 21.07.2011 | Genoa | Werder Bremen | Loan |
| 01.07.2011 | AC Milan | Genoa | € 4M |
| 21.07.2010 | Genoa | AC Milan | € 7M |
| 01.08.2008 | AEK Athens FC | Genoa | € 3.8M |
| 01.01.2006 | AEK Athens FC | — | Loan |