| From | Team | Fee | Apps | Goals | To | |
|---|---|---|---|---|---|---|
| 2001 | Ipswich Town | - | 122 | 47 | 2005 | (Player) |
| 2005 | Charlton Athletic | Β£2,500,000 | 68 | 31 | 2007 | (Player) |
| 2007 | Tottenham Hotspur | Β£16,500,000 | 60 | 18 | 2009 | (Player) |
| 2009 | Sunderland | Β£10,000,000 | 58 | 32 | 2011 | (Player) |
| 2011 | Aston Villa | Β£18,000,000 | 61 | 21 | 2015 | (Player) |
| 2013 | Fulham | Loan | 24 | 3 | 2014 | (On loan) |
| 2014 | Brighton & Hove Albion | Loan | 5 | 2 | 2014 | (On loan) |
| 2015 | Derby County | Loan | 58 | 12 | 2018 | (On loan) |
| 2015 | Derby County | Loan | 15 | 10 | 2015 | (On loan) |
| 2018 | Burton Albion | Loan | 15 | 2 | 2018 | (On loan) |