K. Koizumi

Koizumi's current-season form is level with last season (Season 25→24), while his Rating eased 35→24. His peak season for form remains 2022/23 (Season 39).

Domestic career

Season	Club	Apps	G	A	Match	RTG	Season
2025/26	FC Tokyo · 11th	30	1	2	6.79	24	24
2024/25	FC Tokyo · 7th	34	1	1	6.82	35	25
2023/24	FC Tokyo · 11th	31	1	0	6.65	40	30
2022/23	Sagan Tosu · 11th	30	1	2	7.04	44	39
2021/22	Sagan Tosu · 7th	28	0	0	6.66	44	18
2020/21	Kashima · 5th	22	1	1	6.79	49	27

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year.

Scout report

Experienced headCentral midfielder

K. Koizumi is a 31-year-old central midfielder at FC Tokyo, rated 23.5 overall by Field Insider's model, ranking 673rd of 874 in the J3 League. A seasoned veteran, he has been a rotation option this season (50.6% of available minutes). His defensive output reads 3.49 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Koizumi.

Judged on this season alone, Koizumi graded 24 — an excellent campaign that ranks top 12% of the 241 central midfielders in the J3 League, on 1 goal, 2 assists and 3.488 defensive actions per 90.

Year-on-year, that's broadly in line with last season (Season 25 → 24). Over the 6 seasons on record his form has drifted down, peaking in 2022/23.

On long-term talent our Rating reads 24, 192nd of 241 of the 241 central midfielders in the J3 League. At 31 Koizumi is into the veteran stage, where the age curve weighs on the projection, and a market index of 8 reflects that trajectory.

From the career report

Read the full career report →

Below his 2022/23 peak but holding a solid level — the platform for a return is there.

Peak: 2022/23Holding levelBreakout: 2022/23Remarkably consistent

Current potential192nd of 241 central midfielders · J3 League Current seasonTop 12% central midfielders · J3 League28th-best central midfielder in the J3 League673rd in the J3 League · potential192nd-highest potential central midfielder in the J3 League

23.5

Ratingi

192nd of 241 central midfielders

23.8

Seasoni

below regular-starter level

50.6%

Minutes

rotation minutes

3.49

Def. actions / 90

moderate defensive volume

Output in context · FC Tokyo finished 11th of 20 · a mid-table side

3.49

Def. / 90

Tackles

Interceptions

Clean sheets

3.49 tackles, blocks & interceptions per 90 — moderate defensive volume, with 6 clean sheets across 30 appearances. Going forward he chipped in 1 goal and 2 assists — a useful bonus from the back.

Strengths

Attacking threat. Chips in from deep: 0.16 goal involvements per 90, useful for a central midfielder.

Watch points

Game time. Only 50.6% 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

With a Rating of 23.5, Koizumi carries the 192nd-highest potential of the central midfielders in the J3 League of 241. Defensively he reads as moderate defensive volume (3.49 tackles, blocks & interceptions per 90). 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.

Per 90 & availability

Minutes played %50.6%

Available fixtures38 of 38

Goals / 900.052

Assists / 900.104

Goal contribution / 900.156

Defensive actions / 903.488

Player flow

Goal involvements3

Shot conversion %16.7

Shot accuracy %66.7

Dribble success %57.7

Cards / 900.208

Foul involvement / 903.852

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 31, Koizumi sits on 8, past its peak and easing. The blue line is Koizumi's projected Rating — 23.5 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.