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
2023/24	Yokohama FC	31	0	0	6.95	—	—
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

Squad depthBall-winning Central defender

K. Yamazaki is a 30-year-old central defender at Yokohama FC, enjoying a standout season — 0 goals and 1 assists in 23 appearances, a Season grade of 31. On long-term scout potential he's rated 27.2. An experienced operator, he has been a rotation option (57.5% 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.

On the season, Yamazaki graded 31 for current form (age-blind), 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 27. At 30 Yamazaki is into the veteran stage, where the age curve weighs on the projection, and a market index of 6.2 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

27.2

Ratingi

below regular-starter level

Seasoni

below regular-starter level

57.5%

Minutes

rotation minutes

4.08

Def. actions / 90

solid defensive volume

Output in context · Yokohama FC finished 18th of 20 · a relegation-threatened 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. Doing that for a relegation-threatened side (18th of 20) is harder than the bare numbers suggest: a back line under more pressure has to defend more often and protects fewer leads, so the volume — and any clean sheets — carry real weight. Going forward he chipped in 0 goals and 1 assist — a useful bonus from the back.

Strengths

Defensive volume. 4.08 tackles, blocks & interceptions per 90 — does the unseen work.

Watch points

Game time. Only 57.5% of available minutes — needs a settled run to prove the level.
Level. Rates below a nailed-on top-tier starter on our model.

Outlook

Rated 27.2 overall — below regular-starter level. 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 %57.5%

Available fixtures38 of 38

Goals / 900

Assists / 900.046

Goal contribution / 900.046

Defensive actions / 904.076

Player flow

Goal involvements1

Cards / 900.092

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 (~8), then tapers with age. At 30, Yamazaki sits on 6.2, past its peak and easing. The blue line is Yamazaki's projected Rating — 27.2 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

Assists1

Defending

Tackles31

Interceptions35

Blocks23

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 12th 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 August 29, 2026, when Jubilo Iwata face Tochigi City away in the J2 League.

Field Insider's view

Field Insider currently rates K. Yamazaki at 27.2 with a Season form score of 31. See the full scout report for strengths, watch-points and the market-value outlook.

Career

Across 8 recorded seasons, K. Yamazaki has totalled 283 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 · Yokohama FC finished 18th of 20 · a relegation-threatened side

Strengths

Watch points