Field Insider

ratings updated 17 Oct 2026

Profile

Full nameWilliam John Mannion
PositionGoalkeeper
NationalityEngland
Age28
Date of birth5 May 1998
BirthplaceLondon
Height186 cm
Shirt number#25
ClubCharlton
Goalkeeper
1
Appearances
0
Clean sheets
0%
CS rate
share of apps kept clean
90
Minutes

Domestic-league season · Charlton.

Performance data · by competition

CompetitionAppsMinMatch
League Cup1957.2

Scout report

Squad depthGoalkeeper

W. Mannion is a 28-year-old goalkeeper at Charlton, rated 35.4 overall by Field Insider's model. An experienced operator, he has been a fringe squad member this season (4.3% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Mannion.

On the season, Mannion graded 0 for current form (age-blind), on 0 clean sheets across 1 appearance.

Year-on-year, that's a drop on last season (Season 8 → 0). Over the 5 seasons on record his form has drifted down, peaking in 2024/25.

On long-term talent our Rating reads 35. At 28 Mannion is in his prime years, and a market index of 9.8 reflects that trajectory.

From the career report
Read the full career report →

Below his 2024/25 peak but holding a solid level — the platform for a return is there.

Peak: 2024/25Holding levelBreakout: 2024/25Stepped up 2025/26
35.4
Ratingi
developing / rotation level
0
Seasoni
below regular-starter level
4.3%
Minutes
limited game time
0
Def. actions / 90
light defensive volume

Output in context · Charlton finished 17th of 24 · a lower-table side

1
Apps
0
Clean sheets
0%
CS rate
4.3%
Minutes

0 clean sheets in 1 appearance (0% of games). Keeping that many behind a lower-table side (17th of 24) — a side that concedes more — points to a busy, productive season between the posts.

Watch points

  • Game time. Only 4.3% of available minutes — needs a settled run to prove the level.
  • Level. Rates below a nailed-on top-tier starter on our model.

Outlook

Rated 35.4 overall — developing / rotation level. A limited game time keeper carrying the gloves this season. 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.

Transfer news

No transfer news found for this player.