Domestic-league season · SSV Jahn Regensburg.
| Competition | Apps | G | A | Min | Match |
|---|---|---|---|---|---|
 3. Liga | 10 | 2 | 0 | 882 | 7.15 |
| 3. Ligaat Waldhof Mannheim | 13 | 0 | 0 | 358 | 6.86 |
Following his move to SSV Jahn Regensburg, Karbstein's current-season form is level with last season (Season 8→10), while his Rating eased 31→28. That makes this his strongest season for form to date.
| Season | Club | Apps | G | A | Match | RTG | Season |
|---|---|---|---|---|---|---|---|
| 2025/26 | SSV Jahn Regensburg · 13th | 23 | 2 | 0 | 7.15 | 28 | 10 |
| 2024/25 | Waldhof Mannheim · 16th | 8 | 0 | 0 | 7 | 31 | 8 |
| 2023/24 | Waldhof Mannheim · 16th | 27 | 3 | 0 | 6.88 | 39 | 4 |
| 2022/23 | Waldhof Mannheim · 7th | 8 | 0 | 0 | 7 | 36 | 5 |
Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year.
M. Karbstein is a 28-year-old central defender at SSV Jahn Regensburg, rated 27.6 overall by Field Insider's model, ranking 232nd of 317 in the 3. Liga. An experienced operator, he has been a rotation option this season (36.3% of available minutes). His defensive output reads 3.41 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Karbstein.
Judged on this season alone, Karbstein graded 10 — a workmanlike campaign that ranks 34th of 49 of the 49 centre-backs in the 3. Liga, on 2 clean sheets and 3.411 defensive actions per 90.
Year-on-year, that's broadly in line with last season (Season 8 → 10). Across the 4 seasons we hold, it's his best return yet.
On long-term talent our Rating reads 28, 38th of 49 of the 49 centre-backs in the 3. Liga. At 28 Karbstein is in his prime years, and a market index of 8.6 reflects that trajectory.
Karbstein is operating at his career peak — the 2025/26 level is the level.
3.41 tackles, blocks & interceptions per 90 — moderate defensive volume, with 2 clean sheets across 23 appearances. Going forward he chipped in 2 goals and 0 assists — a useful bonus from the back.
With a Rating of 27.6, Karbstein carries the 38th-highest potential of the centre-backs in the 3. Liga of 49. Defensively he reads as moderate defensive volume (3.41 tackles, blocks & interceptions per 90). Experienced and reliable, but the value curve is easing (1.2× now → 0.9× projected in three years).
Generated from Field Insider's rating model · AI-written analysis to follow.
The gold line is market value — an index (not €) blending rating, age and league. It climbs through the early 20s, peaks around ages 23–27 (~14), then tapers with age. At 28, Karbstein sits on 8.6, past its peak and easing. The blue line is Karbstein's projected Rating — 27.6 today — recomputed at each age, so it follows the same rise-and-fall as a career matures and declines. Solid = up to today; dashed = projected.
No transfer news found for this player.
