| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2020 | 2. Division - Group 1 | 14 | 1021 | 1 | 0 | 0.09 | — |
| 2021 | 2. Division: Group 2 | 25 | 2066 | 6 | 0 | 0.26 | — |
| 2022 | 1. Division | 28 | 1777 | 5 | 3 | 0.41 | — |
| 2023 | 1. Division | 25 | 1841 | 7 | 2 | 0.44 | 7.4 |
| 2024 | 1. Division | 25 | 1980 | 5 | 4 | 0.41 | 7.62 |
| 2025 | 1. Division | 12 | 1013 | 10 | 0 | 0.89 | 6.92 |
| 2025 | Eliteserien | 11 | 889 | 4 | 2 | 0.61 | 7.14 |
| 2026 | Eliteserien | 16 | 1150 | 2 | 3 | 0.39 | 6.9 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Figures computed from the GioScore season-stats database · as of 2026-08-17
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Ranheim | 5 | 3 | 2 | 0 | 0 | 0 | 1 | 0 |
 Stabæk | 4 | 3 | 1 | 0 | 4 | 3 | 0 | 0 |
 Levanger | 4 | 0 | 2 | 2 | 1 | 0 | 2 | 0 |
 Moss | 4 | 2 | 1 | 1 | 2 | 0 | 0 | 0 |
 Sogndal | 4 | 3 | 0 | 1 | 1 | 0 | 0 | 0 |
 Aalesund | 3 | 0 | 1 | 2 | 1 | 0 | 1 | 0 |
 Åsane | 3 | 2 | 0 | 1 | 1 | 1 | 0 | 0 |
 Kongsvinger | 3 | 0 | 0 | 3 | 0 | 0 | 0 | 0 |
 Sandnes Ulf | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
 Bryne | 3 | 2 | 0 | 1 | 2 | 0 | 0 | 0 |
 Raufoss | 3 | 0 | 1 | 2 | 0 | 0 | 0 | 0 |
 Skeid | 3 | 2 | 0 | 1 | 1 | 0 | 0 | 0 |
 Haugesund | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
 Viking | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Vålerenga | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Sandefjord | 2 | 2 | 0 | 0 | 1 | 0 | 0 | 0 |
 Kristiansund | 2 | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
 Rosenborg | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Hødd | 2 | 0 | 0 | 2 | 0 | 0 | 1 | 0 |
 Bodø / Glimt | 2 | 1 | 0 | 1 | 2 | 0 | 0 | 0 |
Across 16 Eliteserien appearances in 2026, M. Grundetjern contributed 2 goals plus 3 assists (1,150 minutes) — 0.39 goal involvements per 90. GioScore's computed rating for the season averages 6.9.
2024 stands as his highest-rated season (7.62, 1. Division), with 2026 the weakest (6.9). The direction of late is downward — 0.29 under his prior average over the last two rated seasons.
