| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2025 | EIF | Ykkösliiga | 0 | 0 | 0 | 0 | 0 | – |
| 2024 | EIF | Veikkausliiga | 1 | 0 | 0 | 0 | 0 | – |
| 2024 | SalPa | Ykkösliiga | 16 | 0 | 0 | 1 | 0 | – |
| 2023 | TPS | Ykkösliiga | 26 | 0 | 0 | 3 | 0 | – |
| 2022 | TPS | Ykkösliiga | 17 | 0 | 0 | 2 | 0 | – |
| 2021 | TPS | Ykkösliiga | 27 | 0 | 0 | 0 | 0 | – |
| 2020 | TPS | Veikkausliiga | 22 | 0 | 0 | 4 | 0 | – |
| 2019 | TPS | Ykkösliiga | 4 | 0 | 0 | 0 | 0 | – |
| 2019 | Palanga | A Lyga | 4 | 0 | 0 | 0 | 0 | – |
| 2018 | Inter Turku | Veikkausliiga | 16 | 0 | 0 | 2 | 0 | – |
| 2017 | Inter Turku | Veikkausliiga | 8 | 0 | 0 | 0 | 0 | – |
| 2016 | SJK | Veikkausliiga | 2 | 0 | 0 | 0 | 0 | – |
| 2015 | SJK Akatemia | Kakkonen | 9 | 0 | 0 | 0 | 0 | – |
| 2015 | SJK | Veikkausliiga | 1 | 0 | 0 | 0 | 0 | – |
| 2014 | Inter Turku | Veikkausliiga | 6 | 0 | 0 | 0 | 0 | – |
| 2013 | Inter Turku | Veikkausliiga | 8 | 0 | 0 | 1 | 0 | – |
| 2012 | Inter Turku | Veikkausliiga | 0 | 0 | 0 | 0 | 0 | – |
| 2012 | KTP | Kakkonen | 9 | 0 | 0 | 1 | 0 | – |
| 2011 | TuTo | Kakkonen | 11 | 0 | 0 | 0 | 0 | – |
| 2011 | Inter Turku | Veikkausliiga | 0 | 0 | 0 | 0 | 0 | – |
| 2010 | Inter Turku | Veikkausliiga | 0 | 0 | 0 | 0 | 0 | – |
| Total | 187 | 0 | 0 | 14 | 0 | – | ||
| Date | From | To | Type | |
|---|---|---|---|---|
| - | SalPa | EIF | Free | |
| 01 Jan 2024 | TPS | SalPa | Free | |
| 08 Sept 2019 | Palanga | TPS | Free | |
| 04 May 2019 | Inter Turku | Palanga | Free | |
| 01 Jan 2017 | SJK | Inter Turku | N/A | |
| 01 Jan 2015 | Inter Turku | SJK | N/A | |
| - | KTP | Inter Turku | N/A |
J. Koponen career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.