Adam
Montgomery
LBScotland · Celtic FC
Player dossierPremiership
AdamMontgomery
LBLeft-BackDefender
- Club
- Celtic FC
- League
- Premiership
- Nationality
- Scotland
- Age
- 23
- Height
- 173 cm
- Foot
- Left
- Valued
- 20 May 2026
Reading the valuation
The market values Montgomery at €400k. Model A, which never saw Montgomery during training, estimates €432k: the market value is 7% below that estimate.
That is a factor of ×1.08. Model A's typical held-out miss is ×1.50 either way, so this gap is within its usual error.
Without league and club, Model B estimates €472k, further from the market. Model B is usually further off (typical miss ×2.07): league and club explain much of how the market prices players.
A gap describes the model's arithmetic for this player's inputs, not what the player is worth.
- Apps
- 9
- Minutes
- 669
- Goals
- 0
- Assists
- 1
- Started
- 8/9
- Min / app
- 74
- Cards
- 2Y 0R
Club matches, two years to the valuation date
The Valuation Journey
What moves Model A
Asking the prediction API to explain Model A for Montgomery…
SHAP describes the model's arithmetic for this player's inputs, not what causes market value. Model B can be explained only by the live service; Model A also has a published explanation for the research players.
Model A vs Model B against the observed €400k
Checking APIAsking the prediction API…
Held-out estimates come from cross-validation, with this player outside the training data: the honest comparison. Served models were refitted on every player, this one included, so they sit closer to the market. Shaded band: Model A's typical miss (×1.50 either way).
Player traitspercentiles vs 2,065 defenders
Dashed ring: the defender median (50th percentile)
Assists per 90
Club assists per 90 minutes in the same window.
0.13 this player0.04 defender median85th percentile
No passing, progression or defensive actions exist in the dataset, so no trait claims to measure them.
Valuation history every Transfermarkt valuation on record
- First valuation
- €150k
- Jun 2021
- Peak
- €500k
- Dec 2022
- Model target
- €400k
- May 2026
- Valuations
- 11
- 7 club changes
May 2026: €400k, Celtic FC. Dotted lines mark the €2M, €10M and €30M tier boundaries.
Show as a table
| Date | Market value | Club |
|---|---|---|
| 2021-06-24 | €150k | Celtic FC B |
| 2021-12-31 | €450k | Celtic FC |
| 2022-06-27 | €450k | Celtic FC |
| 2022-12-13 | €500k | St. Johnstone FC |
| 2023-06-26 | €500k | Celtic FC |
| 2023-12-27 | €500k | Fleetwood Town |
| 2024-05-30 | €500k | Celtic FC |
| 2024-12-03 | €500k | Celtic FC |
| 2025-10-08 | €500k | Livingston FC |
| 2025-12-10 | €400k | Livingston FC |
| 2026-05-20 | €400k | Celtic FC |
Audit context group-level, not about this player
- Audit group
- UEFA
- Population gap, Model A
- +0.093 95% CI +0.063 to +0.124
- This player, market vs held-out A
- −0.076
The group comes from first-listed citizenship and is never a model input. Across the population, non-UEFA players' market values sit about 10% above Model A's held-out estimates, relative to UEFA players in the same leagues. One player's residual says nothing about that pattern (typical miss ×1.50), and none of it is evidence of discrimination: the target may itself be biased. Open the Fairness Audit
In context observed value among comparable players in this build
All players in the Terminal →Premiership311 players · median €400k
Valued above 50% of the 311 Premiership players.
See them in the Explorer →Defenders, all leagues2,065 players · median €2M
Valued above 14% of the 2,065 defenders.
See them in the Explorer →Where Montgomery appears
Watchlists and the comparison tray are kept in this browser only.
Near this valuation closest observed values: same league, then same position
- WrightRWDundee FC · Premiership€400k
- KentCBHeart of Midlothian FC · Premiership€400k
- DhandaAMDundee FC · Premiership€400k
- HamiltonCMDundee FC · Premiership€400k
- YoungRBIpswich Town · defenders€400k
- LovrenCBPAOK Thessaloniki · defenders€400k
- VogtCBVfL Bochum · defenders€400k
- SavicCBTrabzonspor · defenders€400k
Counts and ranks of observed Transfermarkt values only; model errors are never ranked here. Full player export: Every player in the modelling population (D-011).