| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2023 | Sarpsborg 08 | Eliteserien | 0 | 0 | 0 | 0 | 0 | – |
| 2022 | Sarpsborg 08 | Eliteserien | 10 | 0 | 0 | 1 | 0 | 6.4 |
| 2021 | Sarpsborg 08 | Eliteserien | 27 | 3 | 1 | 7 | 0 | 6.9 |
| 2020 | Sarpsborg 08 | Eliteserien | 24 | 0 | 1 | 5 | 0 | 6.7 |
| 2019 | Sarpsborg 08 | Eliteserien | 27 | 1 | 0 | 4 | 0 | 6.9 |
| 2018 | Sarpsborg 08 | Eliteserien | 27 | 2 | 4 | 4 | 0 | 7.2 |
| 2017 | Sarpsborg 08 | Eliteserien | 26 | 1 | 0 | 5 | 0 | 7.0 |
| 2016 | Sarpsborg 08 | Eliteserien | 28 | 1 | 2 | 5 | 0 | 7.0 |
| 2015 | Sarpsborg 08 | Eliteserien | 5 | 0 | 0 | 0 | 0 | – |
| 2014 | Sarpsborg 08 | Eliteserien | 19 | 1 | 0 | 1 | 0 | – |
| 2014 | Valerenga | Eliteserien | 0 | 0 | 0 | 0 | 0 | – |
| 2013 | Valerenga | Eliteserien | 11 | 0 | 0 | 0 | 0 | – |
| 2012 | Valerenga | Eliteserien | 18 | 0 | 0 | 1 | 0 | – |
| 2011 | Fredrikstad | Eliteserien | 27 | 2 | 0 | 5 | 0 | – |
| 2010 | Fredrikstad | Eliteserien | 0 | 0 | 0 | 0 | 0 | – |
| 2010 | Fredrikstad | 1. Division | 27 | 2 | 0 | 4 | 0 | – |
| 2009 | Fredrikstad | Eliteserien | 24 | 0 | 0 | 2 | 0 | – |
| Total | 300 | 13 | 8 | 44 | 0 | – | ||
| Date | From | To | Type | |
|---|---|---|---|---|
| - | Valerenga | Sarpsborg | N/A | |
| - | Fredrikstad | Valerenga | € 200K |
J. Thomassen career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.