| Temporada | Equipo | Competición | PJ | G | A | Nota | ||
|---|---|---|---|---|---|---|---|---|
| 2026 | Sligo Rovers | Premier Division | 5 | 0 | 0 | 2 | 0 | 6.6 |
| 2025 | Sligo Rovers | Premier Division | 3 | 0 | 0 | 0 | 0 | 6.8 |
| 2025 | Derry City | Premier Division | 5 | 0 | 0 | 2 | 0 | 6.4 |
| 2024/2025 | Coleraine | NIFL Premiership | 18 | 0 | 0 | 2 | 0 | – |
| 2024 | Derry City | Premier Division | 2 | 0 | 0 | 0 | 0 | – |
| 2022 | Derry City | Premier Division | 2 | 0 | 0 | 1 | 0 | – |
| 2021 | Derry City | Premier Division | 33 | 1 | 0 | 7 | 0 | – |
| 2020 | Derry City | Premier Division | 18 | 0 | 0 | 3 | 0 | – |
| 2019 | Derry City | Premier Division | 34 | 5 | 0 | 5 | 0 | – |
| 2017/2018 | Coleraine | NIFL Premiership | 4 | 4 | 0 | 0 | 0 | – |
| 2016/2017 | Institute | NIFL Championship | 1 | 1 | 0 | 0 | 0 | – |
| 2015 | Derry City | Premier Division | 1 | 0 | 0 | 0 | 0 | – |
| Total | 126 | 11 | 0 | 22 | 0 | – | ||
| Fecha | Desde | Hacia | Tipo | |
|---|---|---|---|---|
| - | Derry City | Sligo Rovers | Transfer | |
| 01 may 2025 | Coleraine | Derry City | Return from loan | |
| - | Derry City | Coleraine | Loan | |
| 01 feb 2019 | Coleraine | Derry City | Free agent | |
| - | Institute | Coleraine | Free agent | |
| 07 ene 2015 | Derry City | Institute | Free agent |
C. Harkin career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.