Domestic-league season · Kashiwa Reysol.
| Competition | Apps | G | A | Min | Match |
|---|---|---|---|---|---|
 J1 League | 35 | 7 | 4 | 2912 | 7.34 |
 J-League Cup | 1 | 0 | 0 | 31 | — |
Following his move to Kashiwa Reysol, Koizumi's current-season form is up 209% on last season (Season 11→34), while his Rating climbed 36→41. His peak season for form remains 2021/22 (Season 39).
| Season | Club | Apps | G | A | Match | RTG | Season |
|---|---|---|---|---|---|---|---|
| 2025/26 | Kashiwa Reysol · 2nd | 35 | 7 | 4 | 7.34 | 41 | 34 |
| 2024/25 | Urawa · 13th | 20 | 0 | 2 | 6.79 | 36 | 11 |
| 2023/24 | Urawa · 4th | 24 | 1 | 1 | 6.6 | 45 | 19 |
| 2022/23 | Urawa · 9th | 27 | 3 | 2 | 6.91 | 51 | 27 |
| 2021/22 | Urawa · 6th | 34 | 2 | 5 | 7.07 | 55 | 39 |
Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year.
Y. Koizumi is a 29-year-old attacking midfielder at Kashiwa Reysol, rated 41.2 overall by Field Insider's model, ranking 320th of 874 in the J3 League. An experienced operator, he has been an ever-present this season (85.1% of available minutes). He brings 0.34 goal contributions per 90 (0.22 goals, 0.12 assists). Below: strengths, watch-points, market-value outlook and the latest transfer news on Koizumi.
Judged on this season alone, Koizumi graded 34 — an excellent campaign that ranks top 6% of the 71 attacking midfielders in the J3 League, on 7 goals and 4 assists in 35 appearances (0.34 involvements per 90).
Year-on-year, that's a clear step up on last season (Season 11 → 34). Over the 5 seasons on record his form has drifted down, peaking in 2021/22.
On long-term talent our Rating reads 41, 31st of 71 of the 71 attacking midfielders in the J3 League. At 29 Koizumi is in his prime years, and a market index of 17.2 reflects that trajectory.
Below his 2021/22 peak but holding a solid level — the platform for a return is there.
7 goals in 35 appearances (0.2 per game) for a title-challenging side. He also laid on 4 assists, so the all-round involvement reads 11 goal contributions (0.31 per appearance).
With a Rating of 41.2, Koizumi carries the 31st-highest potential of the attacking midfielders in the J3 League of 71. In the final third he profiles as a work-in-progress on end product (0.34 goal contributions per 90). Experienced and reliable, but the value curve is easing (1.1× now → 0.8× projected in three years).
Generated from Field Insider's rating model · AI-written analysis to follow.
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 (~31), then tapers with age. At 29, Koizumi sits on 17.2, past its peak and easing. The blue line is Koizumi's projected Rating — 41.2 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.
No transfer news found for this player.
