| Temporada | Equipo | Competición | PJ | G | A | Nota | ||
|---|---|---|---|---|---|---|---|---|
| 2025/2026 | Linfield | UEFA Conference League | 0 | 0 | 0 | 0 | 0 | – |
| 2025/2026 | Linfield | UEFA Champions League | 0 | 0 | 0 | 0 | 0 | – |
| 2024/2025 | Linfield | UEFA Conference League | 0 | 0 | 0 | 0 | 0 | – |
| 2023/2024 | Linfield | UEFA Conference League | 4 | 0 | 0 | 0 | 0 | – |
| 2022/2023 | Linfield | UEFA Conference League | 2 | 0 | 0 | 0 | 0 | – |
| 2022/2023 | Linfield | UEFA Champions League | 4 | 1 | 0 | 0 | 1 | – |
| 2022/2023 | Linfield | UEFA Europa League | 1 | 0 | 0 | 0 | 0 | – |
| 2021/2022 | Linfield | UEFA Conference League | 4 | 0 | 0 | 0 | 0 | – |
| 2021/2022 | Linfield | UEFA Champions League | 1 | 0 | 0 | 0 | 0 | – |
| 2020/2021 | Linfield | UEFA Champions League | 2 | 0 | 0 | 1 | 0 | – |
| 2019/2020 | Linfield | UEFA Europa League | 6 | 2 | 0 | 0 | 0 | – |
| 2019/2020 | Linfield | UEFA Champions League | 2 | 0 | 0 | 0 | 0 | – |
| 2017/2018 | Linfield | UEFA Champions League | 1 | 0 | 0 | 0 | 0 | – |
| 2016/2017 | Linfield | UEFA Europa League | 2 | 0 | 0 | 0 | 0 | – |
| 2015/2016 | Linfield | UEFA Europa League | 1 | 0 | 0 | 0 | 0 | – |
| Total | 30 | 3 | 0 | 1 | 1 | – | ||
| Date | From | To | Type | |
|---|---|---|---|---|
| - | Oldham Athletic | Coleraine | Loan | |
| 08 Jan 2014 | Oldham Athletic | Linfield | Transfer |
K. Millar career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.