| From | Team | Fee | Apps | Goals | To | |
|---|---|---|---|---|---|---|
| 1994 | PSV Eindhoven | - | 111 | 32 | 1998 | (Player) |
| 1998 | Barcelona | - | 64 | 3 | 2001 | (Player) |
| 2001 | Chelsea | £7,500,000 | 43 | 4 | 2004 | (Player) |
| 2003 | Middlesbrough | Loan | 31 | 4 | 2004 | (On loan) |
| 2004 | Middlesbrough | Free | 36 | 5 | 2005 | (Player) |
| 2005 | Liverpool | Free | 23 | 2 | 2007 | (Player) |
| 2007 | Olympique Marseille | - | 54 | 6 | 2009 | (Player) |
| 2009 | Sunderland | Free | 47 | 4 | 2011 | (Player) |