| From | Team | Fee | Apps | Goals | To | |
|---|---|---|---|---|---|---|
| 1997 | Manchester United | - | 4 | 0 | 2000 | (Player) |
| 1998 | Royal Antwerp | Loan | 0 | 1999 | (On loan) | |
| 2000 | Derby County | £2,000,000 | 86 | 3 | 2003 | (Player) |
| 2003 | Southampton | £1,500,000 | 94 | 4 | 2006 | (Player) |
| 2006 | Stoke City | £225,000 | 45 | 7 | 2007 | (Player) |
| 2007 | Sunderland | £2,500,000 | 22 | 3 | 2008 | (Player) |
| 2008 | Stoke City | £225,000 | 64 | 4 | 2013 | (Player) |
| 2012 | Nottingham Forest | Loan | 6 | 1 | 2012 | (On loan) |
| 2012 | Ipswich Town | Loan | 12 | 0 | 2012 | (On loan) |
| 2013 | Sheffield United | Loan | 15 | 0 | 2013 | (On loan) |
| 2013 | Chester | - | 17 | 1 | 2014 | (Player) |