Kosuke Yamazaki

Following his move to Yokohama FC, Yamazaki's current-season form is up 19% on last season (Season 26→31), while his Rating eased 37→27. That makes this his strongest season for form to date.

Domestic career

Season	Club	Apps	G	A	Match	RTG	Season
2025/26	Yokohama FC · 18th	23	0	1	6.81	27	31
2024/25	Sagan Tosu · 20th	30	1	0	6.71	37	26
2023/24	Sagan Tosu · 14th	33	0	0	6.95	45	30
2022/23	Montedio Yamagata	43	2	0	—	—	—
2021/22	Montedio Yamagata	33	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

Project playerBall-winning Central defender

K. Yamazaki is a 30-year-old central defender at Jubilo Iwata, enjoying a standout season — 0 goals and 1 assists in 23 appearances, a Season grade of 49, top 3% of J2 League centre-backs. On long-term scout potential he's rated 32.6, ranking 54th of 215 in the J2 League. An experienced operator, he has been an ever-present (94.9% of available minutes). His defensive output reads 4.08 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Yamazaki.

Judged on this season alone, Yamazaki graded 49 — a standout campaign that ranks top 3% of the 73 centre-backs in the J2 League, on 7 clean sheets and 4.076 defensive actions per 90.

Year-on-year, that's a clear step up on last season (Season 26 → 31). Across the 3 seasons we hold, it's his best return yet.

On long-term talent our Rating reads 33, top 29% of the 73 centre-backs in the J2 League. At 30 Yamazaki is into the veteran stage, where the age curve weighs on the projection, and a market index of 4.9 reflects that trajectory.

From the career report

Read the full career report →

Yamazaki is operating at his career peak — the 2025/26 level is the level.

Peak: 2025/26Holding levelRemarkably consistent

Current potentialTop 29% centre-backs · J2 League Current seasonTop 3% centre-backs · J2 League 2nd-best centre-back in the J2 League 54th in the J2 League · potential 21st-highest potential centre-back in the J2 League

32.6

Ratingi

21st of 73 centre-backs

48.5

Seasoni

a solid contributor and squad regular

94.9%

Minutes

near ever-present

4.08

Def. actions / 90

solid defensive volume

Output in context · Jubilo Iwata finished 11th of 20 · a mid-table side

Apps

4.08

Def. / 90

Tackles

Interceptions

Clean sheets

4.08 tackles, blocks & interceptions per 90 — solid defensive volume, with 7 clean sheets across 23 appearances. Going forward he chipped in 0 goals and 1 assist — a useful bonus from the back.

Strengths

Availability. On the pitch for 94.9% of available minutes — a dependable presence in the XI.
Defensive volume. 4.08 tackles, blocks & interceptions per 90 — does the unseen work.

Watch points

Level. Rates below a nailed-on top-tier starter on our model.

Outlook

With a Rating of 32.6, Yamazaki carries the 21st-highest potential of the centre-backs in the J2 League (top 29%). Defensively he reads as solid defensive volume (4.08 tackles, blocks & interceptions per 90). Experienced and reliable, but the value curve is easing (1× now → 0.7× projected in three years).

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

Per 90 & availability

Minutes played %94.9%

Available fixtures23 of 11

Goals / 900

Assists / 900.046

Goal contribution / 900.046

Defensive actions / 904.076

Player flow

Goal involvements1

Cards / 900.092

Foul involvement / 901.099

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 (~10), then tapers with age. At 30, Yamazaki sits on 4.9, past its peak and easing. The blue line is Yamazaki's projected Rating — 32.6 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

Shots2

Passing

Assists1

Chances created3

Passes675

Possession

Duels won83

Duels won %59.7%

Fouls won9

Defending

Tackles31

Interceptions35

Blocks23

Fouls committed15

Yellow/red cards

Yellow cards2

Red cards0

Transfer history

Jubilo IwataJan 2026 – now-

Yokohama FCJan 2025 – Jan 2026

Sagan TosuJan 2023 – Jan 2025

Montedio YamagataJan 2021 – Jan 2023Free

Ehime FCuntil Jan 2021

About K. Yamazaki

Kosuke Yamazaki is a 30-year-old centre-back who plays for Jubilo Iwata, born on December 30, 1995 in Saitama, standing 182 cm tall. He is from Japan. Jubilo Iwata currently sit 11th of 20 in the J2 League.

This season

In the current season, K. Yamazaki has made 23 appearances with 0 goals and 1 assist across 1,965 minutes, with 2 yellow cards.

K. Yamazaki's next match is on October 31, 2026, when Jubilo Iwata face Sagan Tosu at home in the J2 League.

Field Insider's view

Field Insider currently rates K. Yamazaki at 32.6 with a Season form score of 48.5, ranking 54th of 215 centre-backs in the J2 League. See the full scout report for strengths, watch-points and the market-value outlook.

Career

Across 8 recorded seasons, K. Yamazaki has totalled 252 club appearances with 7 goals and 1 assist for 4 different clubs. His busiest campaign came in 2022/23, with 43 appearances for Montedio Yamagata.

K. Yamazaki's career has also included time at Yokohama FC, Sagan Tosu, Montedio Yamagata and Ehime FC.

Transfer news

No transfer news found for this player.

Profile

Season stats

Career

Scout report

Output in context · Jubilo Iwata finished 11th of 20 · a mid-table side

Strengths

Watch points