| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2023/2024 | Notts County | League Cup | 1 | 0 | 0 | 1 | 0 | 6.9 |
| 2023/2024 | Notts County | EFL Trophy | 3 | 0 | 0 | 0 | 0 | 7.0 |
| 2023/2024 | Notts County | FA Cup | 1 | 0 | 0 | 1 | 0 | – |
| 2022/2023 | Notts County | FA Trophy | 1 | 0 | 0 | 0 | 0 | – |
| 2021/2022 | Notts County | FA Cup | 2 | 0 | 0 | 0 | 0 | – |
| 2020/2021 | Notts County | FA Trophy | 4 | 0 | 0 | 0 | 0 | – |
| 2019/2020 | Notts County | FA Trophy | 3 | 1 | 0 | 0 | 0 | – |
| 2019/2020 | Notts County | FA Cup | 0 | 0 | 0 | 0 | 0 | – |
| 2018/2019 | Bradford City | EFL Trophy | 2 | 0 | 0 | 0 | 0 | – |
| 2018/2019 | Bradford City | FA Cup | 3 | 0 | 0 | 0 | 0 | – |
| 2017/2018 | Ross County | Scottish Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2017/2018 | Ross County | League Cup | 3 | 0 | 0 | 0 | 0 | – |
| 2016/2017 | Ross County | Scottish Cup | 2 | 1 | 0 | 0 | 0 | – |
| 2016/2017 | Shrewsbury Town | FA Cup | 3 | 1 | 0 | 1 | 0 | – |
| 2016/2017 | Shrewsbury Town | League Cup | 2 | 0 | 0 | 0 | 0 | – |
| 2016/2017 | Shrewsbury Town | EFL Trophy | 2 | 0 | 0 | 0 | 0 | – |
| 2015/2016 | Coventry City | FA Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2015/2016 | Coventry City | League Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2015/2016 | Coventry City | EFL Trophy | 1 | 0 | 0 | 0 | 0 | – |
| 2014/2015 | Coventry City | League Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2014/2015 | Coventry City | EFL Trophy | 2 | 0 | 0 | 1 | 0 | – |
| 2014/2015 | Coventry City | FA Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2013/2014 | Barnsley | League Cup | 2 | 0 | 0 | 0 | 0 | – |
| 2013/2014 | Barnsley | FA Cup | 1 | 1 | 0 | 0 | 0 | – |
| 2012/2013 | Barnsley | FA Cup | 4 | 0 | 0 | 0 | 0 | – |
| 2012/2013 | Barnsley | League Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2011/2012 | Barnsley | League Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2010/2011 | Barnsley | FA Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2009/2010 | Motherwell | League Cup | 2 | 0 | 0 | 0 | 0 | – |
| 2009/2010 | Motherwell | Scottish Cup | 1 | 0 | 0 | 1 | 0 | – |
| 2008/2009 | Motherwell | Scottish Cup | 3 | 0 | 0 | 0 | 0 | – |
| Total | 56 | 4 | 0 | 5 | 0 | – | ||
J. O'Brien career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.