Sean Longstaff

28 yrs · Central midfielder (also DM) · England
Leeds United · Premier League · Foot: right · Height: 187 cm
Risk: ModerateConfidence: MediumSample: MediumDevelopment: LowContract: until 30 Jun 2029
Market value
€15.0M
Updated 6 days ago
Estimated acquisition
€6.1M – €15.5M
Estimated · 20–80% range
Model value
€11.3M – €16.8M
Performance-implied · estimated
Projected (24m)
€4.7M – €11.3M
Resale range · estimated
Potential value gap
-€4.2M – €10.7M
Model value − acquisition

Value picture

Where the market, the likely price and the model estimates sit.

Estimated acquisition€6.1M – €15.5M
Model value (performance-implied)€11.3M – €16.8M
Projected value (24 months)€4.7M – €11.3M
Dashed line: current market value (€15.0M). Bars are 20–80% model ranges; tick = median.

The model rates Sean Longstaff's performance-implied value at EUR 11.3M-16.8M, above the estimated acquisition range of EUR 6.1M-15.5M. Its 24-month market value projection is EUR 4.7M-11.3M. Context-adjusted goal contributions are 1.84x the positional average in the league (1006 minutes, league coefficient 1.30). Confidence is medium: no event-level data (xG, progressive actions) is available from the current free source, and injury history is unavailable.

Bargain Index: 13

What drives the score. Not a black box: each component and its level.

PerformanceHigh86.7th pct among MID peers (age-neutral)
AgeUnfavorable28.7 years
Acquisition costFavorableest. €10.1M vs market €15.0M
Expected appreciationVery low-53% over ~2 years (model)
Value gapLargeweak predictor on its own
DevelopmentLow
League translationBig-five leagueleague coefficient 1.3
Tactical fitNot evaluatedRequires event/role data not available from the current free source.
RiskModerate
Data confidenceMedium

Bargain Index = percentile (among all evaluated players) of expected 2-year value relative to estimated cost. See methodology and backtests.

Market value history

Market value ≠ transfer fee ≠ acquisition cost.

Highest recorded: €25.0M

Profile vs positional peers

Percentiles among 1163 evaluated MID players with 900+ minutes.

Performance (last season, league)

Minutes
1006 (29% of available)
Goals + assists / 90
0.36
Context-adjusted G+A / 90
0.40
xG, xA, progression
Data unavailable
Defensive actions
Data unavailable
Performance percentile
87 (High)

Adjusted = shrunk toward positional baseline for small samples, corrected for team dominance over opponents, expressed relative to positional peers in the same league.

Context

League strength
1.30 (rank 1)
Team strength (Elo)
1521
Opponent strength
1573
Possession, role
Data unavailable

League strength 1.00 = average club of the big-five leagues. Elo includes continental matches.

Potential

Development
Low
Trajectory
improving
Breakout probability
Age > 23
Resale range (24m)
€4.7M – €11.3M

Trajectory drivers: changed club; team strength down (-132 Elo); relative output up 321% vs positional peers.

Historical comparables (8): median 2-year value change -38% (IQR -55% to +13%).

Risk profile

Overall: Moderate

  • ⚠Limited sample: 1006 league minutes last season.
  • ⚠Played under 40% of available league minutes (injury data unavailable, cause unknown).
  • ⓘInjury history unavailable from current data source.

League translation

What happened to players who moved from this league to the big-five leagues (observed, not a forecast).

Already playing in a big-five league.

Output is relative to positional peers in each league. Movers are a selected group (clubs buy players who fit), so treat this as context, not a guarantee.

Season-by-season (domestic league)

Context-adjusted values are model outputs.

SeasonClubLeaguePosAppsMinMin shareGAG+A/90Adj. G+A/90Opp. EloTeam EloLeague str.
2025/26Leeds UnitedPremier LeagueCM23100629%220.360.40157315211.30
2024/25Newcastle UnitedPremier LeagueCM2578723%000.000.09153516531.23
2023/24Newcastle UnitedPremier LeagueCM35274780%620.260.19155816101.14
2022/23Newcastle UnitedPremier LeagueCM33251674%140.180.16156116781.23
2021/22Newcastle UnitedPremier LeagueCM24146043%110.120.19158815451.17
2020/21Newcastle UnitedPremier LeagueCM22140841%010.060.15153015001.19
2019/20Newcastle UnitedPremier LeagueCM23137340%110.130.22161614761.14
2018/19Newcastle UnitedPremier LeagueDM867020%110.270.22157015321.22
2018/19Liverpool FCPremier LeagueDM1170%000.000.05145419161.22
2016/17Kilmarnock FCScottish PremiershipCM16134439%300.200.23127012000.48

Cups & continental competitions

SeasonCompetitionClubAppsMinGAAvg opp. Elo
2025/26Fa CupLeeds United421110—
2024/25Fa CupNewcastle United218001—
2023/24Fa CupNewcastle United436210—
2023/24Uefa Champions LeagueNewcastle United5354101676
2022/23Fa CupNewcastle United16000—
2021/22Fa CupNewcastle United16000—
2020/21Fa CupNewcastle United112000—
2019/20Fa CupNewcastle United656711—
2018/19Fa CupNewcastle United329010—
2016/17Scottish Fa CupKilmarnock FC19000—

Small continental samples are shown for context only and are not over-weighted.

Historical comparables

Most similar profiles 2+ years ago (same position group) and what happened next. Chosen by similarity only — failures included.

Player (then)AgeValue then~2y laterOutcome
William Carvalho
Laliga · 2021
29€15.0M€14.0Mflat
Jesse Lingard
Premier League · 2021
29€22.0M€8.0Mfell
Christian Eriksen
Premier League · 2022
30€20.0M€8.0Mfell
Emanuele Giaccherini
Premier League · 2014
29€8.5M€4.0Mfell
Giovani Lo Celso
Premier League · 2024
28€16.0M€8.0Mfell
Tomáš Souček
Premier League · 2020
25€12.0M€45.0Mrose
Romain Saïss
Premier League · 2019
29€5.0M€10.0Mrose
Jeffrey Schlupp
Premier League · 2021
29€9.0M€7.0Mfell

Transfer history

Fees as reported by the source; undisclosed fees shown as unknown, never estimated.

DateFromToFeeMV at time
18 Jul 2025NewcastleLeeds€13.8M€20.0M
1 Jan 2019Newcastle U23NewcastleUnknown€150k
31 May 2018BlackpoolNewcastle U23Free / loan€150k
21 Jul 2017Newcastle U23BlackpoolFree / loan€75k
31 May 2017Kilmarnock FCNewcastle U23Free / loan€75k
9 Jan 2017Newcastle U23Kilmarnock FCFree / loanData unavailable
1 Jul 2015Newcastle U18Newcastle U21UnknownData unavailable

MoneyballAI identifies statistical opportunities from available data. A player flagged as a potential bargain is not guaranteed to succeed, to transfer, to rise in value, or to generate resale profit. Market values, fees and contracts come from third-party sources; ranges are model estimates with stated confidence.