Field Insider
Central midfielderJapanJ1 League

Koki Kumasaka

Squad depthKashiwa Reysol · 25 yrsStarter
48.8
±0%
Ratingi
15.7
±0%
Seasoni
13.3
Valuei

based on the 2025 season · updated 18 Aug 2026

Profile

Full nameKoki Kumasaka
PositionCentral midfielder
NationalityJapan
Age25
Date of birth15 Apr 2001
BirthplaceSaitama
Height185 cm
Shirt number#27
ClubKashiwa Reysol
More about K. Kumasaka →
Central midfielder

Season stats

Full career & schedule →
8
Appearances
0
Goals
0
Assists
613
Minutes

Domestic-league season · Kashiwa Reysol.

Performance data · by competition

CompetitionAppsGAMinMatch
J1 League100817.2

Scout report

Squad depthBall-winning Central midfielder

K. Kumasaka is a 25-year-old central midfielder at Kashiwa Reysol, rated 48.6 overall by Field Insider's model, ranking 15th of 152 on scout potential in the J1 League. 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.

Judged on this season alone, Kumasaka graded 16 — a workmanlike campaign that ranks 15th of 31 of the 31 central midfielders in the J1 League, 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, top 7% of the 31 central midfielders in the J1 League. At 25 Kumasaka is in his prime years, and a market index of 13.3 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 upRemarkably consistent
Current potentialTop 7% central midfielders · J1 LeagueCurrent season15th of 31 central midfielders · J1 League15th-best central midfielder in the J1 League15th in the J1 League · potential2nd-highest potential central midfielder in the J1 League
48.6
Ratingi
2nd of 31 central midfielders
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

18
Apps
4.91
Def. / 90
52
Tackles
27
Interceptions
9
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

With a Rating of 48.6, Kumasaka carries the 2nd-highest potential of the central midfielders in the J1 League (top 7%). 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.

Season statistics

Bars = where he ranks among central 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

Transfer news

No transfer news found for this player.