William Mannion

Squad depth

Charlton · 28 yrs

9.5%

Profile

Full nameWilliam John Mannion

PositionGoalkeeper

NationalityEngland

Age28

Date of birth5 May 1998

BirthplaceLondon

Height186 cm

Shirt number#25

ClubCharlton

More about W. Mannion →

Goalkeeper

Season stats

Full career & schedule →

Appearances

Clean sheets

33%

CS rate

share of apps kept clean

810

Minutes

Domestic-league season · Charlton.

Performance data · by competition

Competition	Apps	Min	Match
Championship	9	810	7.14
League Cup	1	90	7.2
FA Cup	1	90	6.5

Career

Full career & schedule →

Mannion's current-season form is down 80% on last season (Season 41→8), while his Rating eased 43→39. His peak season for form remains 2024/25 (Season 41).

Domestic career

Season	Club	Apps	CS	CS%	Match	RTG	Season
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
2021/22	Havant & WvilleLoan	11	0	0%	—	—	—

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 3 earlier seasons in the full career.

Scout report

Squad depthGoalkeeper

W. Mannion is a 28-year-old goalkeeper at Charlton, rated 39 overall by Field Insider's model, ranking 397th of 493 on scout potential in the Championship. An experienced operator, he has been a fringe squad member this season (20.5% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Mannion.

Judged on this season alone, Mannion graded 8 — a workmanlike campaign that ranks 28th of 44 of the 44 goalkeepers in the Championship, on 3 clean sheets across 9 appearances.

Year-on-year, that's a drop on last season (Season 41 → 8). Over the 4 seasons on record his form has trended upward, peaking in 2024/25.

On long-term talent our Rating reads 39, 29th of 44 of the 44 goalkeepers in the Championship. At 28 Mannion is in his prime years, and a market index of 10.8 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

Current potential29th of 44 goalkeepers · Championship · 9 apps Current season28th of 44 goalkeepers · Championship · 9 apps28th-best goalkeeper in the Championship397th in the Championship · potential29th-highest potential goalkeeper in the Championship

Ratingi

29th of 44 goalkeepers

8.3

Seasoni

below regular-starter level

20.5%

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

20.5%

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 20.5% of available minutes — needs a settled run to prove the level.
Level. Rates below a nailed-on top-tier starter on our model.

Outlook

With a Rating of 39, Mannion carries the 29th-highest potential of the goalkeepers in the Championship of 44 — though on just 9 appearances this season, so the standing rests on a small sample. 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 %20.5%

Available fixtures44 of 46

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 900

Player flow

Goal involvements0

Pass accuracy %52

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 10.8, past its peak and easing. The blue line is Mannion's projected Rating — 39 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.

Shooting

Goals0

Passing

Assists0

Pass accuracy52%

Possession

Fouls won2

Yellow/red cards

Yellow cards0

Red cards0

Transfer history

Charlton2024/25 – nowFree

Cambridge United(back from loan)2021/22 – 2024/25

HHavant & Wville(on loan)2021/22 – 2021/22

Cambridge United2021/22 – 2021/22Free

Pafos2020/21 – 2021/22

Kidderminster Harriersuntil 2020/21

Aldershot Town(on loan)2018/19 – 2020/21

Plymouth(on loan)2017/18 – 2018/19

Hull Cityuntil 2017/18

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 19th of 24 in the Championship.

This season

In the current season, W. Mannion has made 9 appearances with 0 goals and 0 assists across 810 minutes, averaging a 7.08 match rating over his last 10 rated games. His season has spanned the Championship, the League Cup and the FA Cup.

When W. Mannion plays, Charlton's record this season is 3W-3D-5L — and his match ratings average 6.91 at home against 7.4 on the road.

Recent matches

April 18, 2026: 1-1 draw away at Sheffield Wednesday (90 minutes, 6.9 rating)
April 11, 2026: 1-2 loss at home vs Preston (90 minutes, 6.7 rating)
April 6, 2026: 1-1 draw away at Watford (90 minutes, 7.3 rating)
April 3, 2026: 1-2 loss at home vs Bristol City (90 minutes, 7.3 rating)
March 21, 2026: 0-1 loss at home vs Norwich (90 minutes, 7.2 rating)
March 14, 2026: 1-1 draw away at Oxford United (90 minutes, 6.7 rating)
March 11, 2026: 1-0 win away at Middlesbrough (90 minutes, 8.7 rating)
March 7, 2026: 1-0 win at home vs Birmingham (90 minutes, 7 rating)
February 28, 2026: 0-1 loss at home vs Wrexham (90 minutes, 6.5 rating)
January 10, 2026: 1-5 loss at home vs Chelsea (90 minutes, 6.5 rating)

Field Insider's view

Field Insider currently rates W. Mannion at 39 with a Season form score of 8.3, ranking 397th of 493 goalkeepers in the Championship. See the full scout report for strengths, watch-points and the market-value outlook.

Availability: W. Mannion has missed 2 matches this season through injury.

Career

Across 8 recorded seasons, W. Mannion has totalled 119 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, Pafos, Kidderminster Harriers, Aldershot Town, Plymouth and Hull City.

Transfer news

No transfer news found for this player.

Profile

Season stats

Performance data · by competition

Career

Scout report

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

Watch points