| Temporada | Equipo | Competición | PJ | G | A | Nota | ||
|---|---|---|---|---|---|---|---|---|
| 2025/2026 | St. Mirren | Scottish Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2025/2026 | St. Mirren | League Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2024/2025 | Morton | Scottish Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2024/2025 | Morton | Challenge Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2024/2025 | Morton | League Cup | 4 | 0 | 0 | 1 | 0 | – |
| 2023/2024 | Morton | Scottish Cup | 4 | 0 | 0 | 0 | 0 | – |
| 2023/2024 | Morton | Challenge Cup | 2 | 0 | 1 | 0 | 0 | – |
| 2023/2024 | Morton | League Cup | 4 | 0 | 0 | 1 | 0 | – |
| Total | 18 | 0 | 1 | 2 | 0 | – | ||
| Fecha | Desde | Hacia | Tipo | |
|---|---|---|---|---|
| 07 ene 2025 | Morton | St. Mirren | Free agent | |
| 07 ene 2023 | Clyde | Morton | Free agent | |
| - | Celtic | Clyde | Free agent | |
| 05 may 2021 | Queen's Park | Celtic | Return from loan | |
| - | Celtic | Queen's Park | Loan | |
| - | Cove Rangers | Celtic | Return from loan | |
| - | Celtic | Cove Rangers | Loan |
R. Mullen career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.