Kohei 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	—	—	—
2021/22	Omiya Ardija	20	1	—	—	—

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 5 earlier seasons in the full career.

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 20% of J2 League centre-backs. On long-term scout potential he's rated 11.6, ranking 203rd of 226 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 strong campaign that ranks top 20% of the 75 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, 69th of 75 of the 75 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 potential69th of 75 centre-backs · J2 League · 13 apps Current season15th of 75 centre-backs · J2 League · 13 apps 15th-best centre-back in the J2 League 203rd in the J2 League · potential 69th-highest potential centre-back in the J2 League

11.6

Ratingi

69th of 75 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

Apps

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 69th-highest potential of the centre-backs in the J2 League of 75 — 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.

Season statistics

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

Shooting

Goals0

Passing

Assists0

Yellow/red cards

Yellow cards0

Red cards0

Transfer history

Tokushima VortisJan 2025 – now

JEF United Chiba(on loan)Jul 2024 – Jan 2025

Tokyo VerdyJan 2022 – Jul 2024Free

Omiya Ardijauntil Jan 2022

About K. Yamakoshi

Kohei Yamakoshi is a 33-year-old centre-back who plays for Tokushima Vortis, born on May 4, 1993 in Yaita, standing 183 cm tall. He is from Japan. Tokushima Vortis currently sit 18th of 20 in the J2 League.

This season

In the current season, K. Yamakoshi has made 13 appearances with 0 goals and 0 assists across 1,170 minutes.

K. Yamakoshi's next match is on August 29, 2026, when Tokushima Vortis face Oita Trinita at home in the J2 League.

Field Insider's view

Field Insider currently rates K. Yamakoshi at 11.6 with a Season form score of 15, ranking 203rd of 226 centre-backs in the J2 League. See the full scout report for strengths, watch-points and the market-value outlook.

Career

Across 10 recorded seasons, K. Yamakoshi has totalled 186 club appearances with 5 goals and 0 assists for 4 different clubs. His busiest campaign came in 2023/24, with 32 appearances for Tokyo Verdy.

K. Yamakoshi's career has also included time at JEF United Chiba, Tokyo Verdy and Omiya Ardija.

Transfer news

No transfer news found for this player.

Profile

Season stats

Career

Scout report

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

Watch points