based on the 2025 season · updated 22 Aug 2026
Profile
Season stats
Full career & schedule →Domestic-league season · FC Ryukyu.
Also this season
On loan at FC Ryukyu — J-League Cup: 1 apps, 0g 0a, 90 min
The headline Season rating covers his time at Roasso Kumamoto; availability counts only fixtures while in this squad.
Scout report
S. Nagai is a 27-year-old central midfielder at FC Ryukyu, rated 21 overall by Field Insider's model, ranking 113th of 267 on scout potential in the J3 League. In his prime years, he has been a rotation option this season (36.6% of available minutes). His defensive output reads 1.3 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Nagai.
Judged on this season alone, Nagai graded 12 — a strong campaign that ranks top 22% of the 96 central midfielders in the J3 League, on 1 goal, 2 assists and 1.295 defensive actions per 90.
We hold a single season for Nagai, so there's no year-on-year comparison to draw yet — the read above is this campaign only.
On long-term talent our Rating reads 21, 40th of 96 of the 96 central midfielders in the J3 League. At 27 Nagai is in his prime years, and a market index of 1.8 reflects that trajectory.
Output in context · FC Ryukyu finished 16th of 20 · a lower-table side
1.3 tackles, blocks & interceptions per 90 — light defensive volume, with 3 clean sheets across 22 appearances. Doing that for a lower-table side (16th 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 1 goal and 2 assists — a useful bonus from the back.
Strengths
- Attacking threat. Chips in from deep: 0.22 goal involvements per 90, useful for a central midfielder.
Watch points
- Game time. Only 36.6% of available minutes — needs a settled run to prove the level.
- Defensive numbers. Modest 1.3 defensive actions per 90 for the position.
- Level. Rates below a nailed-on top-tier starter on our model.
Outlook
With a Rating of 21, Nagai carries the 40th-highest potential of the central midfielders in the J3 League of 96, and he is posting that for a lower-table side (FC Ryukyu finished 16th of 20) — individual numbers are harder to earn on a struggling team, so his underlying level likely sits a touch above the ranking. Defensively he reads as light defensive volume (1.3 tackles, blocks & interceptions per 90). In the prime window — at or near peak market value, so the next two seasons are the ones to cash in or build around.
Generated from Field Insider's rating model · AI-written analysis to follow.
Season statistics
Bars = where he ranks among central midfielders in the J3 League with 600+ minutes this season.
Shooting
Passing
Defending
Yellow/red cards
Transfer news
No transfer news found for this player.
