| Temporada | Equipo | Competición | PJ | G | A | Nota | ||
|---|---|---|---|---|---|---|---|---|
| 2025/2026 | Burnley | Premier League | 18 | 2 | 2 | 2 | 0 | 6.9 |
| 2024/2025 | Burnley | Championship | 44 | 2 | 3 | 11 | 0 | 7.2 |
| 2023/2024 | Burnley | Premier League | 25 | 2 | 3 | 9 | 0 | 7.1 |
| 2022/2023 | Burnley | Championship | 41 | 1 | 4 | 7 | 0 | 7.0 |
| 2021/2022 | Anderlecht | Jupiler Pro League | 40 | 1 | 0 | 4 | 0 | 7.2 |
| 2020/2021 | Anderlecht | Jupiler League | 27 | 0 | 1 | 6 | 1 | – |
| 2019/2020 | Charlton | Championship | 34 | 1 | 2 | 7 | 0 | 7.2 |
| 2018/2019 | Charlton | League One | 3 | 0 | 1 | 0 | 0 | 7.4 |
| 2018/2019 | West Ham U23 | Premier League 2 | 3 | 1 | 0 | 0 | 0 | – |
| 2017/2018 | West Ham | Premier League | 2 | 0 | 0 | 0 | 0 | 6.2 |
| 2017/2018 | Bolton | Championship | 12 | 0 | 0 | 1 | 0 | 6.6 |
| 2016/2017 | Bradford City | League One | 3 | 0 | 0 | 0 | 0 | 7.0 |
| 2015/2016 | Bradford City | League One | 17 | 0 | 0 | 4 | 0 | – |
| 2015/2016 | West Ham U21 | Premier League U21 | 4 | 4 | 0 | 0 | 0 | – |
| 2015/2016 | West Ham | Premier League | 1 | 0 | 0 | 0 | 0 | – |
| 2014/2015 | West Ham U21 | Premier League U21 | 2 | 2 | 0 | 0 | 0 | – |
| 2013/2014 | West Ham U21 | Premier League U21 | 1 | 1 | 0 | 0 | 0 | – |
| Total | 277 | 17 | 16 | 51 | 1 | – | ||
| Fecha | Desde | Hacia | Tipo | |
|---|---|---|---|---|
| 07 dic 2022 | Anderlecht | Burnley | Transfer | |
| 10 may 2020 | West Ham | Anderlecht | Transfer | |
| - | Charlton | West Ham | Return from loan | |
| 08 jul 2019 | West Ham | Charlton | Loan | |
| - | Charlton | West Ham | Return from loan | |
| - | West Ham | Charlton | Loan | |
| 01 feb 2018 | Bolton | West Ham | Return from loan | |
| 08 ene 2017 | West Ham | Bolton | Loan | |
| - | Bradford City | West Ham | Return from loan | |
| 08 ago 2016 | West Ham | Bradford City | Loan | |
| - | Bradford City | West Ham | Return from loan | |
| 02 nov 2016 | West Ham | Bradford City | Loan |
J. Cullen career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.