K. Yamakoshi

Following his move to Tokushima Vortis, Yamakoshi's current-season form is up 275% on last season (Season 4→15), while his Rating eased 18→12. That makes this his strongest season for form to date.

Domestic career

Season	Club	Apps	G	Match	RTG	Season
2025/26	Tokushima Vortis · 4th	13	0	—	12	15
2024/25	JEF United ChibaLoan	12	0	—	—	—
2024/25	Tokyo Verdy · 6th	4	0	6.38	18	4
2023/24	Tokyo Verdy	32	2	—	—	—
2022/23	Tokyo Verdy	20	1	—	—	—

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

Scout report

Experienced headCentral defender

K. Yamakoshi is a 33-year-old central defender at Tokushima Vortis, enjoying a standout season — 0 goals and 0 assists in 13 appearances, a Season grade of 15, top 4% of J2 League centre-backs. On long-term scout potential he's rated 11.6, ranking 180th of 200 in the J2 League. A seasoned veteran, he has been a fringe squad member (32.5% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Yamakoshi.

Judged on this season alone, Yamakoshi graded 15 — a standout campaign that ranks top 5% of the 70 centre-backs in the J2 League, on 6 clean sheets and 0 defensive actions per 90.

Year-on-year, that's a clear step up on last season (Season 4 → 15).

On long-term talent our Rating reads 12, 63rd of 70 of the 70 centre-backs in the J2 League. At 33 Yamakoshi is into the veteran stage, where the age curve weighs on the projection, and a market index of 1.2 reflects that trajectory.

Current potential63rd of 70 centre-backs · J2 League · 13 apps Current season3rd of 70 centre-backs · J2 League · 13 apps3rd-best centre-back in the J2 League180th in the J2 League · potential63rd-highest potential centre-back in the J2 League

11.6

Ratingi

63rd of 70 centre-backs

Seasoni

below regular-starter level

32.5%

Minutes

limited game time

Def. actions / 90

light defensive volume

Output in context · Tokushima Vortis finished 4th of 20 · an upper-table side

Def. / 90

—

Tackles

—

Interceptions

Clean sheets

0 tackles, blocks & interceptions per 90 — light defensive volume, with 6 clean sheets across 13 appearances. Behind an upper-table side (4th of 20) the side controls more games, so the defensive load is lighter — the value sits as much in composure and ball progression as in raw volume.

Watch points

Game time. Only 32.5% of available minutes — needs a settled run to prove the level.
Age curve. At 33, 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 11.6, Yamakoshi carries the 63rd-highest potential of the centre-backs in the J2 League of 70 — though on just 13 appearances this season, so the standing rests on a small sample. Defensively he reads as light defensive volume (0 tackles, blocks & interceptions per 90). Veteran phase — a short-term, lower-fee proposition as both level and value decline (0.7× and falling).

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

Per 90 & availability

Minutes played %32.5%

Available fixtures40 of 40

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 (~4), then tapers with age. At 33, Yamakoshi sits on 1.2, past its peak and easing. The blue line is Yamakoshi's projected Rating — 11.6 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.