| Youth career | |||
|---|---|---|---|
| 1986–1990 | Fettercairn YFC | ||
| 1990–1996 | Crumlin United | ||
| 1996–1997 | Wolverhampton Wanderers | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) |
| 1997–1999 | Wolverhampton Wanderers | 73 | (24) |
| 1999–2000 | Coventry City | 31 | (12) |
| 2000–2001 | Inter Milan | 6 | (0) |
| 2001 | → Leeds United (loan) | 18 | (9) |
| 2001–2002 | Leeds United | 28 | (4) |
| 2002–2008 | Tottenham Hotspur | 197 | (80) |
| 2008–2009 | Liverpool | 19 | (5) |
| 2009–2011 | Tottenham Hotspur | 41 | (11) |
| 2010 | → Celtic (loan) | 16 | (12) |
| 2011 | → West Ham United (loan) | 9 | (2) |
| 2011–2016 | LA Galaxy | 125 | (83) |
| 2012 | → Aston Villa (loan) | 6 | (3) |
| 2017–2018 | ATK | 9 | (6) |
| Total | 578 | (251) | |
| International career | |||
| 1996 | Republic of Ireland U16 | 3 | (1) |
| 1998 | Republic of Ireland U18 | 4 | (3) |
| 1999 | Republic of Ireland U20 | 4 | (0) |
| 1998–2016 | Republic of Ireland | 146 | (68) |
| Managerial career | |||
| 2018 | ATK | ||
| 2023–2024 | Maccabi Tel Aviv | ||
| 2025– | Ferencváros | ||
| *Club domestic league appearances and goals | |||