| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2025 | Drogheda United | Premier Division | 0 | 0 | 0 | 0 | 0 | – |
| 2024 | Drogheda United | Premier Division | 22 | 0 | 1 | 6 | 0 | 6.9 |
| 2023 | Drogheda United | Premier Division | 34 | 0 | 0 | 6 | 0 | 6.9 |
| 2022 | Drogheda United | Premier Division | 33 | 1 | 0 | 6 | 1 | – |
| 2021 | Drogheda United | Premier Division | 32 | 0 | 0 | 10 | 0 | – |
| 2020 | Shelbourne | Premier Division | 18 | 3 | 0 | 5 | 0 | – |
| 2019/2020 | Cambridge United | League Two | 0 | 0 | 0 | 0 | 0 | – |
| 2018/2019 | Cambridge United | League Two | 41 | 1 | 0 | 13 | 0 | – |
| 2017/2018 | Cambridge United | League Two | 42 | 0 | 0 | 5 | 0 | – |
| 2016/2017 | Shrewsbury Town | League One | 40 | 0 | 0 | 13 | 0 | – |
| 2015/2016 | Southend United | League One | 25 | 0 | 0 | 11 | 0 | – |
| 2014/2015 | Southend United | League Two | 24 | 0 | 0 | 10 | 0 | – |
| 2013/2014 | Northampton Town | League Two | 27 | 1 | 0 | 7 | 0 | – |
| 2012/2013 | Hibernian | Premiership | 20 | 0 | 0 | 8 | 0 | – |
| 2011/2012 | Coventry City | Championship | 24 | 3 | 0 | 5 | 0 | – |
| 2010/2011 | Coventry City | Championship | 1 | 0 | 0 | 0 | 0 | – |
| 2010/2011 | Coventry City | Championship | 0 | 0 | 0 | 0 | 0 | – |
| 2009/2010 | Coventry City | Championship | 17 | 2 | 0 | 2 | 0 | – |
| 2009 | Bohemians | Premier Division | 23 | 2 | 0 | 4 | 0 | – |
| 2007 | Longford Town | Premier Division | 0 | 0 | 0 | 0 | 0 | – |
| Total | 423 | 13 | 1 | 111 | 1 | – | ||
| Date | From | To | Type | |
|---|---|---|---|---|
| 12 Dec 2020 | Shelbourne | Drogheda | Free | |
| 01 Jan 2020 | Cambridge Utd | Shelbourne | Free | |
| 07 Jan 2017 | Shrewsbury | Cambridge Utd | Free | |
| 07 Jan 2016 | Southend | Shrewsbury | Free | |
| - | Northampton | Southend | Free | |
| - | Hibernian | Northampton | Free | |
| 08 Dec 2012 | Coventry | Hibernian | N/A | |
| - | Galway U | Bohemians | Free | |
| - | Longford | Galway U | Free |
G. Deegan career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.