| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2024/2025 | Marine | FA Trophy | 1 | 0 | 0 | 0 | 0 | – |
| 2023/2024 | Harrogate Town | EFL Trophy | 0 | 0 | 0 | 0 | 0 | 6.9 |
| 2023/2024 | Harrogate Town | FA Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2023/2024 | Hartlepool United | FA Trophy | 1 | 0 | 0 | 0 | 0 | – |
| 2023/2024 | Harrogate Town | FA Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2023/2024 | Harrogate Town | League Cup | 1 | 0 | 0 | 0 | 0 | 7.3 |
| 2023/2024 | Harrogate Town | EFL Trophy | 1 | 1 | 0 | 0 | 0 | 6.9 |
| 2022/2023 | Harrogate Town | League Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2022/2023 | Harrogate Town | EFL Trophy | 0 | 0 | 0 | 0 | 0 | – |
| 2022/2023 | Harrogate Town | FA Cup | 2 | 0 | 0 | 2 | 0 | – |
| 2021/2022 | Rotherham United | League Cup | 1 | 0 | 0 | 0 | 0 | 6.9 |
| 2021/2022 | Rotherham United | FA Cup | 1 | 0 | 0 | 1 | 0 | – |
| 2021/2022 | Rotherham United | EFL Trophy | 5 | 1 | 0 | 1 | 0 | 7.4 |
| 2020/2021 | Rotherham United | League Cup | 1 | 0 | 0 | 0 | 0 | 7.2 |
| 2020/2021 | Rotherham United | FA Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2019/2020 | Rotherham United | League Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2019/2020 | Rotherham United | EFL Trophy | 1 | 0 | 0 | 0 | 0 | – |
| 2019/2020 | Rotherham United | FA Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2018/2019 | Rotherham United | FA Cup | 1 | 0 | 0 | 0 | 0 | 5.7 |
| 2017/2018 | Rotherham United | League Cup | 1 | 0 | 0 | 1 | 0 | – |
| 2017/2018 | Rotherham United | EFL Trophy | 1 | 0 | 0 | 0 | 0 | – |
| 2017/2018 | Rotherham United | FA Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2016/2017 | Rotherham United | League Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2016/2017 | Rotherham United | FA Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2015/2016 | Rotherham United | FA Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2014/2015 | Sheffield Wednesday | League Cup | 3 | 0 | 0 | 0 | 0 | – |
| 2013/2014 | Sheffield Wednesday | FA Cup | 3 | 1 | 0 | 2 | 0 | – |
| 2012/2013 | Sheffield Wednesday | League Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2012/2013 | Sheffield Wednesday | FA Cup | 2 | 0 | 0 | 0 | 0 | – |
| 2011/2012 | West Bromwich Albion | League Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2011/2012 | West Bromwich Albion | FA Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2011/2012 | West Bromwich Albion | League Cup | 2 | 0 | 0 | 0 | 0 | – |
| 2010/2011 | West Bromwich Albion | League Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2009/2010 | West Bromwich Albion | League Cup | 2 | 0 | 0 | 0 | 0 | – |
| 2009/2010 | West Bromwich Albion | FA Cup | 3 | 1 | 0 | 0 | 0 | – |
| 2008/2009 | Leicester City | FA Cup | 4 | 0 | 0 | 0 | 0 | – |
| Total | 41 | 4 | 0 | 7 | 0 | – | ||
| Date | From | To | Type | |
|---|---|---|---|---|
| 08 Nov 2009 | Leicester City | West Bromwich Albion | Transfer | |
| - | West Bromwich Albion | Sheffield United | Loan | |
| - | West Bromwich Albion | Portsmouth | Loan | |
| - | West Bromwich Albion | Brighton & Hove Albion | Loan | |
| 07 Jan 2022 | Rotherham United | Harrogate Town | Free Transfer | |
| - | Harrogate Town | Hartlepool United | Loan | |
| - | Hartlepool United | Harrogate Town | Back from Loan | |
| - | Harrogate Town | Marine | Free Transfer |
J. Mattock career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.