Koki Kumasaka

Kumasaka's current-season form is level with last season (Season 16→16), while his Rating held around 49. His peak season for form remains 2025/26 (Season 16).

Domestic career

Season	Club	Apps	Match	RTG	Season
2027/28	Kashiwa Reysol · 2nd	3	7.2	49	16
2026/27	Kashiwa Reysol	1	6.5	—	—
2025/26	Kashiwa Reysol · 2nd	18	7.14	49	16
2024/25	Kashiwa Reysol · 17th	10	6.68	40	3

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

Japan · international

Side	Apps	G
Japan	18	0

Career caps & goals — tournament breakdown in the full career.

Scout report

Squad depthBall-winning Defensive midfielder

K. Kumasaka is a 25-year-old defensive midfielder at Kashiwa Reysol, rated 48.8 overall by Field Insider's model. In his prime years, he has been a rotation option this season (46.1% of available minutes). His defensive output reads 4.91 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Kumasaka.

On the season, Kumasaka graded 16 for current form (age-blind), on 0 goals, 0 assists and 4.914 defensive actions per 90.

Year-on-year, that's broadly in line with last season (Season 16 → 16). Over the 3 seasons on record his form has trended upward, peaking in 2025/26.

On long-term talent our Rating reads 49. At 25 Kumasaka is in his prime years, and a market index of 13.4 reflects that trajectory.

From the career report

Read the full career report →

A career still climbing — Kumasaka is at his peak right now, and the curve hasn't flattened.

Peak: 2025/26Trending up

48.8

Ratingi

a solid contributor and squad regular

15.7

Seasoni

below regular-starter level

46.1%

Minutes

rotation minutes

4.91

Def. actions / 90

solid defensive volume

Output in context · Kashiwa Reysol finished 2nd of 20 · a title-challenging side

Apps

4.91

Def. / 90

Tackles

Interceptions

Clean sheets

4.91 tackles, blocks & interceptions per 90 — solid defensive volume, with 9 clean sheets across 18 appearances. Behind a title-challenging side (2nd 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.

Strengths

Defensive volume. 4.91 tackles, blocks & interceptions per 90 — does the unseen work.

Watch points

Game time. Only 46.1% of available minutes — needs a settled run to prove the level.

Outlook

Rated 48.8 overall — a solid contributor and squad regular. Defensively he reads as solid defensive volume (4.91 tackles, blocks & interceptions per 90). Approaching peak years; value is still building (price multiplier 2×) with the best seasons likely ahead.

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

Per 90 & availability

Minutes played %46.1%

Available fixtures38 of 38

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 904.914

Player flow

Goal involvements0

Cards / 900.229

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 (~13), then tapers with age. At 25, Kumasaka sits on 13.4, at or near its peak. The blue line is Kumasaka's projected Rating — 48.8 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 defensive midfielders in the J1 League with 600+ minutes this season.

Shooting

Goals0—

Passing

Assists0—

Defending

Tackles52—

Interceptions27—

Blocks7—

Yellow/red cards

Yellow cards4

Red cards0

About K. Kumasaka

Koki Kumasaka is a 25-year-old defensive midfielder who plays for Kashiwa Reysol, born on April 15, 2001 in Saitama, standing 185 cm tall. He is from Japan. Kashiwa Reysol currently sit 2nd of 20 in the J1 League.

This season

In the current season, K. Kumasaka has made 3 appearances with 0 goals and 0 assists across 261 minutes.

K. Kumasaka's next match is on August 29, 2026, when Kashiwa Reysol face Shimizu S-pulse away in the J1 League.

Field Insider's view

Field Insider currently rates K. Kumasaka at 48.8 with a Season form score of 15.7. See the full scout report for strengths, watch-points and the market-value outlook.

Career

Across 4 recorded seasons, K. Kumasaka has totalled 32 club appearances with 0 goals and 0 assists for 1 club. His busiest campaign came in 2025/26, with 18 appearances for Kashiwa Reysol.

On the international stage, K. Kumasaka has represented Japan — 18 caps in our records.

Transfer news

No transfer news found for this player.