John Mousinho — GafferLens Lab
John Mousinho
Portsmouth· EFL Championship · 
England · Age 40
72/ 100
Solid
44th percentile of covered managers
Career snapshot
Age
40
30 APR 1986
Appointed
20 JAN 2023
Tenure
3Y 8M
3 years, 8 months
Contractⓘ
Until 30 June 2028
Extended after Championship survival
Senior managerial experienceⓘ
3 years, 8 months
Since 5 JAN 2023
In coaching
3 years, 8 months
Includes academy & assistant roles
Season: 2026/27Competition: EFL ChampionshipUpdated: Updated todaySource: GafferLens editorial review — appointment, contract and career dates manually verified to the 21 August 2026 baseline
GafferLens Lab
Advanced manager intelligence
GafferLens publishes a metric only when it holds the inputs for it. Where a metric is defined but empty, the definition and methodology are shown so the roadmap is transparent — no estimated xG, PPDA, field tilt or development scores are ever generated.
- Points per gameData not currently available
League points won divided by matches managed in the current spell.
- Win rateData not currently available
Share of matches won in the current spell, all competitions in the held record.
- Performance relative to resourcesGafferLens metricData not currently available
Actual league position measured against the position GafferLens editorial expected from the squad's resources.
- Tactical Flexibility IndexGafferLens metricData not currently available
How much a manager's team actually changes behaviour — not how many formations they name.
- Before / under manager comparisonGafferLens metricData not currently available
Team performance in the period before the appointment compared with performance since, adjusted for sample size.
- In-game managementData not currently available
Points gained from losing positions, points lost from winning positions, and results after tactical substitutions.
- Player development outputData not currently available
Minutes given to under-21 players, senior debuts awarded, and measurable improvement in individual output.
- Style versus resultsData not currently available
Whether the tactical approach actually produces outcomes — for example press intensity against high regains, or field tilt against xG.
- Adaptability by opponent styleGafferLens metricData not currently available
Results and performance against high presses, low blocks, back threes and possession-dominant opponents.
Methodology & data freshness
GafferScore 0.4 (provisional editorial) · tactical model 0.3 (prototype model) · rankings updated 2026-08-17. Form window: Last 10 competitive matches, recency weighted.
Updated today · Confidence HIGH · Source: GafferLens editorial review — appointment, contract and career dates manually verified to the 21 August 2026 baseline
Image credits
Visual: GafferLens generic Portsmouth shirt — an original unbranded illustration using traditional club colours. No licensed photograph verified for John Mousinho (status: PLACEHOLDER).