| From | Team | Fee | Apps | Goals | To | |
|---|---|---|---|---|---|---|
| 2005 | Grays Athletic | - | 68 | 20 | 2006 | (Player) |
| 2006 | Southend United | Free | 32 | 2 | 2008 | (Player) |
| 2007 | Leyton Orient | Loan | 4 | 2 | 2007 | (On loan) |
| 2008 | Scunthorpe United | £175,000 | 81 | 43 | 2010 | (Player) |
| 2008 | Hereford | Loan | 19 | 11 | 2008 | (On loan) |
| 2010 | Celtic | £2,400,000 | 95 | 63 | 2013 | (Player) |
| 2013 | Norwich City | £5,000,000 | 64 | 18 | 2016 | (Player) |
| 2015 | Sheffield Wednesday | Loan | 12 | 6 | 2016 | (On loan) |
| 2016 | Sheffield Wednesday | Loan | 70 | 24 | 2019 | (On loan) |
| 2019 | Wellington | - | 33 | 12 | 2022 | (Player) |
| 2020 | - | - | 18 | 5 | 2021 | (Player) |
| 2021 | Wellington Phoenix | - | 14 | 4 | 2022 | (Player) |
| 2022 | AC Omonia Nicosia | - | 13 | 2 | 2023 | (Player) |
| 2023 | Barnet | Free | 7 | 2 | 2023 | (Player) |
| 2024 | Kettering Town | - | 5 | 1 | 2025 | (Player) |
| 2025 | Maldon & Tiptree | - | 2 | 1 | Current | (Player) |