| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2013/2014 | Enterprise National League (England) | 21 | — | 3 | 0 | — | — |
| 2014/2015 | League One (England) | 1 | 518 | 0 | 2 | 0.35 | — |
| 2015/2016 | League One (England) | 19 | 1183 | 0 | 4 | 0.3 | — |
| 2016/2017 | League Two (England) | 19 | — | 1 | 0 | — | — |
| 2017/2018 | League Two (England) | 17 | 413 | 1 | 0 | 0.22 | — |
| 2018/2019 | Premiership | 11 | 585 | 0 | 1 | 0.15 | — |
| 2018/2019 | League One (England) | 13 | 460 | 0 | 0 | 0 | — |
| 2019/2020 | League Two (England) | 34 | 2532 | 3 | 4 | 0.25 | 6.9 |
| 2020/2021 | League Two (England) | 39 | 2911 | 4 | 6 | 0.31 | 7.15 |
| 2021/2022 | League One (England) | 25 | 1265 | 2 | 1 | 0.21 | 6.94 |
| 2022 | Premier Division | 8 | 429 | 1 | 0 | 0.21 | — |
| 2023 | Premier Division | 19 | 279 | 1 | 0 | 0.32 | 6.73 |
| 2024 | Premier Division | 24 | 1003 | 1 | 0 | 0.09 | 6.82 |
| 2025 | Premier Division | 12 | 319 | 0 | 0 | 0 | 6.72 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Figures computed from the GioScore season-stats database · as of 2026-07-23
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Newport County | 10 | 3 | 3 | 4 | 1 | 0 | 2 | 0 |
 Exeter City | 10 | 3 | 3 | 4 | 3 | 0 | 1 | 0 |
 Oldham Athletic | 8 | 6 | 0 | 2 | 0 | 0 | 0 | 0 |
 Port Vale | 8 | 4 | 0 | 4 | 1 | 0 | 2 | 0 |
 Cheltenham Town | 8 | 3 | 3 | 2 | 0 | 1 | 0 | 0 |
 Derry City | 8 | 2 | 3 | 3 | 0 | 0 | 0 | 0 |
 Crewe Alexandra | 7 | 3 | 2 | 2 | 0 | 0 | 1 | 0 |
 Mansfield Town | 7 | 1 | 3 | 3 | 0 | 0 | 1 | 0 |
 Cambridge United | 7 | 1 | 1 | 5 | 0 | 0 | 0 | 0 |
 Gillingham | 7 | 3 | 2 | 2 | 0 | 0 | 0 | 0 |
 Stevenage | 7 | 0 | 4 | 3 | 0 | 1 | 0 | 0 |
 Portsmouth | 6 | 3 | 1 | 2 | 1 | 0 | 1 | 0 |
 Colchester United | 6 | 4 | 2 | 0 | 2 | 2 | 0 | 0 |
 Scunthorpe United | 6 | 3 | 1 | 2 | 0 | 2 | 0 | 0 |
 Plymouth Argyle | 6 | 2 | 0 | 4 | 0 | 0 | 1 | 0 |
 Bradford City | 6 | 1 | 2 | 3 | 1 | 0 | 1 | 0 |
 Wycombe Wanderers | 6 | 1 | 4 | 1 | 0 | 1 | 2 | 0 |
 Crawley Town | 6 | 1 | 4 | 1 | 0 | 0 | 0 | 0 |
 Leyton Orient | 6 | 3 | 1 | 2 | 0 | 0 | 0 | 0 |
 Carlisle United | 6 | 1 | 3 | 2 | 1 | 0 | 1 | 0 |
John O'Sullivan went through 12 Premier Division appearances in 2025 (319 minutes) without a goal or an assist. That season graded out at an average match rating of 6.72.
2020/2021 stands as his highest-rated season (7.15, League Two (England)), with 2025 the weakest (6.72). The direction of late is downward — 0.16 under his prior average over the last two rated seasons.
