M. Karbstein

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.

Domestic career

Season	Club	Apps	G	Match	RTG	Season
2025/26	SSV Jahn Regensburg · 13th	23	2	7.15	28	10
2025/26	Waldhof Mannheim	13	0	6.86	—	—
2024/25	Waldhof Mannheim · 16th	8	0	7	31	8
2023/24	Waldhof Mannheim · 16th	27	3	6.88	39	4
2022/23	Waldhof Mannheim · 7th	8	0	7	36	5
2021/22	Kickers Offenbach	7	0	—	—	—

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 4 earlier seasons and 4 youth-team spells in the full career.

Scout report

Squad depthCentral defender

M. Karbstein is a 28-year-old central defender at SSV Jahn Regensburg, rated 27.6 overall by Field Insider's model, ranking 236th of 323 on scout potential 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 53 of the 53 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, 42nd of 53 of the 53 centre-backs in the 3. Liga. At 28 Karbstein is in his prime years, and a market index of 3.1 reflects that trajectory.

From the career report

Read the full career report →

Karbstein is operating at his career peak — the 2025/26 level is the level.

Peak: 2025/26Holding levelRemarkably consistent

Current potential42nd of 53 centre-backs · 3. Liga Current season34th of 53 centre-backs · 3. Liga34th-best centre-back in the 3. Liga236th in the 3. Liga · potential42nd-highest potential centre-back in the 3. Liga

27.6

Ratingi

42nd of 53 centre-backs

9.8

Seasoni

below regular-starter level

36.3%

Minutes

rotation minutes

3.41

Def. actions / 90

moderate defensive volume

Output in context · SSV Jahn Regensburg finished 13th of 20 · a mid-table side

3.41

Def. / 90

Tackles

Interceptions

Clean sheets

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.

Watch points

Game time. Only 36.3% of available minutes — needs a settled run to prove the level.
Level. Rates below a nailed-on top-tier starter on our model.

Outlook

With a Rating of 27.6, Karbstein carries the 42nd-highest potential of the centre-backs in the 3. Liga of 53. 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.

Per 90 & availability

Minutes played %36.3%

Available fixtures38 of 38

Goals / 900.145

Assists / 900

Goal contribution / 900.145

Defensive actions / 903.411

Player flow

Goal involvements2

Shot conversion %50

Shot accuracy %23.5

Pass accuracy %79

Dribble success %75

Cards / 900.29

Foul involvement / 902.903

Season-by-season progression

Rating (potential)Season (form)

Value & potential by age

Market valueRating

Solid = now · dashed = projected

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 (~5), then tapers with age. At 28, Karbstein sits on 3.1, 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.