Stefan Posch

Club football at 1. FSV Mainz 05.

Sourced facts, dated and on the record. Squad membership, and his club when a source names one. Nothing invented; we don’t make players up.

At a glance

age
28
sourced with the squad
position
Defence
Austria
club
1. FSV Mainz 05
football-data.org
club tier
1672
ClubElo strength
our board
#733
of 1424 rated players
folded so far
3479′
49 appearances
possession-adjusted defensive actions per 90 (tackles + interceptions + blocks)
5.06
95th percentile of peers

Sourced

squad: Austria · Defencefootball-data.org · 2026-06-29
club: 1. FSV Mainz 05football-data.org · 2026-06-29

Sourced context, nothing more. It never touches a call.

Our rating · the working

the board →

1727 ±45

his quality rating: club, age and measured output. The board orders by this plus his World Cup form, less a discount for how much we can measure him.

How the number is builtopenclose

1803 full roster Elo (+76 from national-team results)

the ± is how settled the number is, more minutes, tighter band

Tier 2, lineups + results, how rich the evidence is, not just how much

at or near his peak, no projected upside from age

Where he starts (his team’s strength, we refuse to invent what we haven’t measured) plus two fixed nudges make the quality rating above; the last line is what national-team results have added since, taking it to his full roster Elo.

starts at Austria's strengththe fair club-over-national anchor, every player's starting point: 1697
age curve at 28 (defences' curve)the position's measured peak, no discount either way: +0
defensive actions in club football, possession-adjustedhis percentile among minutes-qualified peers, from club seasons: +30
quality rating · club, age + measured output: 1727
form: national-team results, 49 appearances3479 minutes, weighted by margin, surprise and his match stats, but shared across the XI: +76
full roster Elo · with results: 1803

Where the +30 skill term comes from

Not a reputation, a measurement. We score every shot in the data ourselves and rank him among minutes-qualified peers; a fixed arithmetic turns that rank into points.

measured: 5.06 possession-adjusted defensive actions per 90 (tackles + interceptions + blocks)
his rank: 95th percentile of qualified peers
scored from: recent club seasons (api-football), an individual box-stat proxy, possession-adjusted; volume, not a quality verdict
the arithmetic: 46 pts/σ × z(94.9th) = 46 × 1.63 × 0.4 (position weight) = +30

A forward-only shadow signal, as of 2026-06-28. The skill term comes from our own xG models over the open archive; the rest is earned, recorded per appearance, auditable, never back-filled. It never moves a live call.

The notebook

The lines a beat writer keeps, except every one of ours is read off the ledger above, auditable to the night. Nothing invented.

standing
#733 of 1424 rated players on our board.
vs his seed
The folded nights have added +76 to the number he seeded with, he has outplayed his own prior.

What he’d cost · our estimate

€4.9m–€19m ≈ €9.6m

Not a figure from any valuation site; we don’t republish those. Our own model: the level he plays at, what we’ve measured of him, his age and his role. A band, not a point: we can’t see contract length or release clauses, the two biggest real drivers, so we say so.

The workingopenclose

reference feea mid-tier-club, peak-age forward of average measured skill: €8m
club tier 1672the level he plays at, the strongest signal of what a club pays: ×1.77
ageage 28, past the fee-peak, value falls ~18% a year: ×0.82
defender fee factorstrikers set the market's top; midfield runs close; defence and goal at the record books' discounts: ×0.58
individual skillmeasured 95th percentile of peers: ×1.46
our estimate: ≈ €9.6m

fee-model v3 priors (panel-anchored, 2026-06), calibrated against our reported fees. The band is roughly two-in-three likely; contract length and release clauses are data we don’t hold. Context only, it never touches a call.

The fee record · sourced

The market’s last public word: €5m (2023-07). Our estimate today: ≈ €9.6m. The gap is evidence, many of them, together, recalibrate our model; no single one rewrites him.

our read: undervalued , we rate him 92% above his last market price (a gem signal, context only)

2026-01-21Como → FSV Mainz 05loan
2026-01-19Como → Bolognaloan
2025-09-01Bologna → Comoloan
2025-07-01Atalanta → Bolognaloan

Reported moves, dated and attributed (api-football.com), news facts, not a valuation site’s estimates. It never touches a call.

In our coverage · Austria’s record

at Algeria3–3Called it
at Argentina2–0Called it
v Jordan3–1Called it

The newsroom’s calls on Austria. Team-level, never dressed up as a player stat.