William Mannion

Mannion's current-season form is level with last season (Season 8→8), while his Rating held around 39. His peak season for form remains 2024/25 (Season 41).

Domestic career

Season	Club	Apps	CS	CS%	Match	RTG	Season
2026/27	Charlton · 3rd	1	0	0%	6.9	39	8
2025/26	Charlton · 19th	9	3	33%	7.14	39	8
2024/25	Charlton · 4th	31	14	45%	6.87	43	41
2023/24	Cambridge United · 18th	14	4	29%	7.02	39	8
2022/23	Cambridge United · 20th	13	3	23%	6.62	40	5

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 4 earlier seasons in the full career.

Scout report

Squad depthGoalkeeper

W. Mannion is a 28-year-old goalkeeper at Charlton, rated 38.8 overall by Field Insider's model. An experienced operator, he has been a fringe squad member this season (19.6% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Mannion.

On the season, Mannion graded 8 for current form (age-blind), on 3 clean sheets across 9 appearances.

Year-on-year, that's broadly in line with last season (Season 8 → 8). Over the 5 seasons on record his form has trended upward, peaking in 2024/25.

On long-term talent our Rating reads 39. At 28 Mannion is in his prime years, and a market index of 10.7 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

38.8

Ratingi

developing / rotation level

7.9

Seasoni

below regular-starter level

19.6%

Minutes

limited game time

Def. actions / 90

light defensive volume

Output in context · Charlton finished 19th of 24 · a lower-table side

Apps

Clean sheets

33%

CS rate

19.6%

Minutes

3 clean sheets in 9 appearances (33% of games). Keeping that many behind a lower-table side (19th of 24) — a side that concedes more — points to a busy, productive season between the posts.

Watch points

Game time. Only 19.6% 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 38.8 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.

Per 90 & availability

Minutes played %19.6%

Available fixtures46 of 46

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 900

Player flow

Goal involvements0

Cards / 900

Season-by-season progression

Rating (potential)Season (form)

Value & potential by age

Market valueRating

Solid = now · dashed = projected

The gold line is market value — an index (not €) blending rating, age and league. It climbs through the early 20s, peaks around ages 23–27 (~18), then tapers with age. At 28, Mannion sits on 10.7, past its peak and easing. The blue line is Mannion's projected Rating — 38.8 today — recomputed at each age, so it follows the same rise-and-fall as a career matures and declines. Solid = up to today; dashed = projected.

Season statistics

Bars = where he ranks among goalkeepers in the Championship with 600+ minutes this season.

Goalkeeping

Clean sheets3

Yellow/red cards

Yellow cards0

Red cards0

Transfer history

CharltonJun 2024 – nowFree

Cambridge United(back from loan)Jan 2022 – Jun 2024

HHavant & Wville(on loan)Oct 2021 – Jan 2022

Cambridge UnitedAug 2021 – Oct 2021Free

PPafosuntil Aug 2021

AAldershot Town(on loan)Aug 2018 – Aug 2021

Plymouth(on loan)Nov 2017 – Aug 2018

Hull Cityuntil Nov 2017

About W. Mannion

William John Mannion is a 28-year-old goalkeeper who plays for Charlton, born on May 5, 1998 in London, standing 186 cm tall. He is from England. Charlton currently sit 3rd of 24 in the Championship.

This season

In the current season, W. Mannion has made 1 appearances with 0 goals and 0 assists across 90 minutes.

W. Mannion's next match is on August 26, 2026, when Charlton face Tottenham away in the League Cup.

Field Insider's view

Field Insider currently rates W. Mannion at 38.8 with a Season form score of 7.9. See the full scout report for strengths, watch-points and the market-value outlook.

Career

Across 9 recorded seasons, W. Mannion has totalled 120 club appearances with 0 goals and 0 assists for 7 different clubs. His busiest campaign came in 2024/25, with 31 appearances for Charlton.

W. Mannion's career has also included time at Cambridge United, HHavant & Wville, PPafos, AAldershot Town, Plymouth and Hull City.

Transfer news

No transfer news found for this player.