Serie B · Midfielder · #0 · Ghana · 36 yrs
| Date | Type | From | To |
|---|---|---|---|
| 2021-07-01 | Free |  Monza MON |  Hertha BSC HER |
| 2020-09-28 | N/A |  Fiorentina FIO | Monza MON |
| 2020-01-31 | Loan | Fiorentina FIO |  Beşiktaş BES |
| 2019-01-21 | Loan |  Sassuolo SAS |  Barcelona BAR |
| 2018-07-05 | Free |  Eintracht Frankfurt EIN | Sassuolo SAS |
| 2017-08-18 | Free |  Las Palmas PAL | Eintracht Frankfurt EIN |
| 2016-08-02 | Free |  AC Milan MIL | Las Palmas PAL |
| 2013-08-30 | € 12M | AC Milan MIL |  FC Schalke 04 SCH |
| 2011-07-01 | € 7.5M |  Genoa GEN | AC Milan MIL |
| 2010-08-16 | Loan | Genoa GEN | AC Milan MIL |
| 2010-07-01 | € 6.5M |  Portsmouth POR | Genoa GEN |
| 2009-09-01 | € 4.5M |  Tottenham TOT | Portsmouth POR |
| 2009-07-01 | N/A |  Borussia Dortmund DOR | Tottenham TOT |
| 2009-01-11 | Loan | Tottenham TOT | Borussia Dortmund DOR |
| 2007-08-01 | € 7.9M | Hertha BSC HER | Tottenham TOT |