Ryuta Koike

Koike's current-season form is level with last season (Season 38→38), while his Rating held around 33. His peak season for form remains 2021/22 (Season 43).

Domestic career

Season	Club	Apps	G	A	Match	RTG	Season
2027/28	Kashima · 3rd	1	0	0	6.9	33	38
2026/27	Kashima	7	0	0	6.69	—	—
2025/26	Kashima · 1st	29	1	3	6.9	33	38
2024/25	Yokohama F. Marinos · 9th	7	0	1	7.01	31	4
2023/24	Yokohama F. Marinos	1	0	0	—	—	—

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 7 earlier seasons in the full career.

Japan · international

Side	Apps	G
Japan	2	0

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

Scout report

Project playerCentral defender

R. Koike is a 30-year-old central defender at Kashima, enjoying a standout season — 1 goals and 3 assists in 29 appearances, a Season grade of 38. On long-term scout potential he's rated 32.5. An experienced operator, he has been a regular starter (68.5% of available minutes). His defensive output reads 2.5 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Koike.

On the season, Koike graded 38 for current form (age-blind), on 11 clean sheets and 2.496 defensive actions per 90.

Year-on-year, that's broadly in line with last season (Season 38 → 38). Over the 6 seasons on record his form has trended upward, peaking in 2021/22.

On long-term talent our Rating reads 33. At 30 Koike is into the veteran stage, where the age curve weighs on the projection, and a market index of 7.4 reflects that trajectory.

From the career report

Read the full career report →

Below his 2021/22 peak but holding a solid level — the platform for a return is there.

Peak: 2021/22Holding levelBreakout: 2021/22

32.5

Ratingi

below regular-starter level

38.3

Seasoni

developing / rotation level

68.5%

Minutes

a regular starter

2.5

Def. actions / 90

moderate defensive volume

Output in context · Kashima finished 1st of 20 · a title-challenging side

Apps

2.5

Def. / 90

Tackles

Interceptions

Clean sheets

2.5 tackles, blocks & interceptions per 90 — moderate defensive volume, with 11 clean sheets across 29 appearances. Behind a title-challenging side (1st 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. Going forward he chipped in 1 goal and 3 assists — a useful bonus from the back.

Strengths

Availability. On the pitch for 68.5% of available minutes — a dependable presence in the XI.
Attacking threat. Chips in from deep: 0.15 goal involvements per 90, useful for a central defender.

Watch points

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

Outlook

Rated 32.5 overall — below regular-starter level. Defensively he reads as moderate defensive volume (2.5 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 %68.5%

Available fixtures38 of 38

Goals / 900.038

Assists / 900.115

Goal contribution / 900.154

Defensive actions / 902.496

Player flow

Goal involvements4

Cards / 900.077

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 (~15), then tapers with age. At 30, Koike sits on 7.4, past its peak and easing. The blue line is Koike's projected Rating — 32.5 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 J1 League with 600+ minutes this season.

Shooting

Goals1

Passing

Assists3

Defending

Tackles33

Interceptions25

Blocks7

Yellow/red cards

Yellow cards2

Red cards0

Transfer history

KashimaJan 2025 – now

Yokohama F. MarinosMay 2020 – Jan 2025Free

LLokerenJul 2019 – May 2020

Kashiwa ReysolJan 2017 – Jul 2019

Renofa Yamaguchiuntil Jan 2017

About R. Koike

Ryuta Koike is a 30-year-old centre-back who plays for Kashima, born on August 29, 1995 in Hachioji, standing 170 cm tall. He is from Japan. Kashima currently sit 3rd of 20 in the J1 League.

This season

In the current season, R. Koike has made 1 appearances with 0 goals and 0 assists across 14 minutes.

R. Koike's next match is on August 29, 2026, when Kashima face Tokyo Verdy away in the J1 League.

Field Insider's view

Field Insider currently rates R. Koike at 32.5 with a Season form score of 38.3. See the full scout report for strengths, watch-points and the market-value outlook.

His honours include 6 career titles — among them the Super Cup and the J1 League. Full list in the career record.

Career

Across 12 recorded seasons, R. Koike has totalled 277 club appearances with 15 goals and 19 assists for 5 different clubs. His busiest campaign came in 2016/17, with 42 appearances for Renofa Yamaguchi.

R. Koike's career has also included time at Yokohama F. Marinos, LLokeren, Kashiwa Reysol and Renofa Yamaguchi.

On the international stage, R. Koike has represented Japan — 2 caps in our records.

Transfer news

No transfer news found for this player.