| Date | Type | From | To |
|---|---|---|---|
| 2023-07-01 | Free |  Liverpool LIV |  Brighton BRI |
| 2015-07-06 | Free |  Manchester City MCI | Liverpool LIV |
| 2010-08-17 | € 22M |  Aston Villa AST | Manchester City MCI |
| 2008-08-31 | € 15M |  Newcastle NEW | Aston Villa AST |
| 2006-07-01 | N/A | Aston Villa AST | Newcastle NEW |
| 2005-08-31 | Loan | Newcastle NEW | Aston Villa AST |
| 2004-07-01 | € 7.4M |  Leeds LEE | Newcastle NEW |
| 2003-10-01 | N/A |  Swindon Town SWI | Leeds LEE |
| 2003-09-01 | Loan | Leeds LEE | Swindon Town SWI |
