Field Insider

William Popp

Experienced headShonan Bellmare · 31 yrsStarter

based on the 2025 season · updated 18 Aug 2026

Profile

Full nameWilliam Popp
PositionGoalkeeper
NationalityJapan
Age31
Date of birth21 Oct 1994
BirthplaceHino
Height192 cm
Shirt number#1
ClubShonan Bellmare
Goalkeeper
7
Appearances
1
Clean sheets
14%
CS rate
share of apps kept clean
630
Minutes

Domestic-league season · Shonan Bellmare.

Scout report

Experienced headGoalkeeper

W. Popp is a 31-year-old goalkeeper at Shonan Bellmare, rated 18.1 overall by Field Insider's model. A seasoned veteran, he has been a fringe squad member this season (18.4% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Popp.

On the season, Popp graded 1 for current form (age-blind), on 1 clean sheet across 7 appearances.

Year-on-year, that's a drop on last season (Season 6 → 1). Over the 3 seasons on record his form has drifted down, peaking in 2024/25.

On long-term talent our Rating reads 18. At 31 Popp is into the veteran stage, where the age curve weighs on the projection, and a market index of 2.2 reflects that trajectory.

From the career report
Read the full career report →

Popp is operating at his career peak — the 2024/25 level is the level.

Peak: 2024/25Holding level
18.1
Ratingi
below regular-starter level
1.4
Seasoni
below regular-starter level
18.4%
Minutes
limited game time
0
Def. actions / 90
light defensive volume

Output in context · Shonan Bellmare finished 19th of 20 · a relegation-threatened side

7
Apps
1
Clean sheets
14%
CS rate
18.4%
Minutes

1 clean sheet in 7 appearances (14% of games). Keeping that many behind a relegation-threatened side (19th of 20) — a side that concedes more — points to a busy, productive season between the posts.

Watch points

  • Game time. Only 18.4% of available minutes — needs a settled run to prove the level.
  • Age curve. At 31, both level and resale value are on the downslope.
  • Level. Rates below a nailed-on top-tier starter on our model.

Outlook

Rated 18.1 overall — below regular-starter level. A limited game time keeper carrying the gloves this season. Veteran phase — a short-term, lower-fee proposition as both level and value decline (0.9× and falling).

Generated from Field Insider's rating model · AI-written analysis to follow.

Season statistics

Bars = where he ranks among goalkeepers in the J2 League with 600+ minutes this season.

Goalkeeping

Clean sheets1

Yellow/red cards

Yellow cards0
Red cards0

Transfer news

No transfer news found for this player.