Sai van Wermeskerken

Wermeskerken's current-season form is level with last season (Season 18→20), while his Rating eased 28→24. His peak season for form remains 2020/21 (Season 26).

Domestic career

Season	Club	Apps	G	A	Match	RTG	Season
2025/26	Kawasaki Frontale · 8th	26	0	4	6.85	24	20
2024/25	Kawasaki Frontale · 8th	24	1	2	7	28	18
2023/24	Kawasaki Frontale	13	1	0	6.89	—	—
2023/24	NEC Nijmegen · 6th	3	0	0	6.43	32	2
2022/23	Cambuur · 17th	24	1	0	6.71	44	26
2021/22	PEC Zwolle · 18th	7	0	0	6.43	41	4

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 U23	4	0

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

Scout report

Experienced headFull-back

S. van Wermeskerken is a 32-year-old full-back at Kawasaki Frontale, rated 23.5 overall by Field Insider's model, ranking 274th of 379 on scout potential in the J1 League. A seasoned veteran, he has been a regular starter this season (61.5% of available minutes). His defensive output reads 2.95 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Wermeskerken.

Judged on this season alone, Wermeskerken graded 20 — a workmanlike campaign that ranks 29th of 50 of the 50 full-backs in the J1 League, on 5 clean sheets and 2.95 defensive actions per 90.

Year-on-year, that's broadly in line with last season (Season 18 → 20). Over the 6 seasons on record his form has drifted down, peaking in 2020/21.

On long-term talent our Rating reads 24, 42nd of 50 of the 50 full-backs in the J1 League. At 32 Wermeskerken is into the veteran stage, where the age curve weighs on the projection, and a market index of 3.6 reflects that trajectory.

From the career report

Read the full career report →

Below his 2020/21 peak but holding a solid level — the platform for a return is there.

Peak: 2020/21Holding levelRemarkably consistent4 clubs

Current potential42nd of 50 full-backs · J1 League Current season29th of 50 full-backs · J1 League29th-best full-back in the J1 League274th in the J1 League · potential42nd-highest potential full-back in the J1 League

23.5

Ratingi

42nd of 50 full-backs

19.8

Seasoni

below regular-starter level

61.5%

Minutes

a regular starter

2.95

Def. actions / 90

moderate defensive volume

Output in context · Kawasaki Frontale finished 8th of 20 · a mid-table side

2.95

Def. / 90

Tackles

Interceptions

Clean sheets

2.95 tackles, blocks & interceptions per 90 — moderate defensive volume, with 5 clean sheets across 26 appearances. Going forward he chipped in 0 goals and 4 assists — a useful bonus from the back.

Strengths

Availability. On the pitch for 61.5% of available minutes — a dependable presence in the XI.
Attacking threat. Chips in from deep: 0.17 goal involvements per 90, useful for a full-back.

Watch points

Age curve. At 32, both level and resale value are on the downslope.
Level. Rates below a nailed-on top-tier starter on our model.

Outlook

With a Rating of 23.5, Wermeskerken carries the 42nd-highest potential of the full-backs in the J1 League of 50. Defensively he reads as moderate defensive volume (2.95 tackles, blocks & interceptions per 90), with a bit more on the ball than most in the role. Veteran phase — a short-term, lower-fee proposition as both level and value decline (0.8× and falling).

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

Per 90 & availability

Minutes played %61.5%

Available fixtures38 of 38

Goals / 900

Assists / 900.171

Goal contribution / 900.171

Defensive actions / 902.95

Player flow

Goal involvements4

Shot conversion %0

Shot accuracy %12.5

Dribble success %60.9

Cards / 900.086

Foul involvement / 901.71

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 (~9), then tapers with age. At 32, Wermeskerken sits on 3.6, past its peak and easing. The blue line is Wermeskerken's projected Rating — 23.5 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 full-backs in the J1 League with 600+ minutes this season.

Shooting

Goals0

Shots on target2

Shots16

Passing

Assists4

Chances created21

Passes1,101

Possession

Successful dribbles14

Dribble success60.9%

Duels won84

Duels won %49.7%

Fouls won15

Defending

Tackles44

Interceptions19

Blocks6

Fouls committed25

Yellow/red cards

Yellow cards2

Red cards0

Transfer history

Free agent2025/26 – nowFree

Kawasaki Frontale2023/24 – 2025/26Free

NEC Nijmegenuntil 2023/24

Cambuur2022/23 – 2023/24

PEC Zwolle2019/20 – 2022/23Free

Cambuur2017/18 – 2019/20

Dordrechtuntil 2017/18

About S. van Wermeskerken

Sai van Wermeskerken is a 32-year-old full-back who plays for Kawasaki Frontale, born on June 28, 1994 in Maastricht, standing 178 cm tall. He is from Japan. Kawasaki Frontale currently sit 8th of 20 in the J1 League.

This season

In the current season, S. van Wermeskerken has made 26 appearances with 0 goals and 4 assists across 2,105 minutes, averaging a 6.85 match rating over his last 10 rated games, with 2 yellow cards.

When S. van Wermeskerken plays, Kawasaki Frontale's record this season is 11W-7D-8L — and his match ratings average 6.79 at home against 6.91 on the road.

Recent matches

December 6, 2025: 0-4 loss away at Urawa (45 minutes, 6.3 rating)
November 30, 2025: 1-2 loss at home vs Sanfrecce Hiroshima (82 minutes, 6.6 rating)
November 8, 2025: 1-1 draw at home vs Fagiano Okayama (90 minutes, 6.9 rating)
October 25, 2025: 0-2 loss away at Cerezo Osaka (90 minutes, 6.6 rating)
October 18, 2025: 5-3 win at home vs Shimizu S-pulse (90 minutes, 1 assist, 7 rating)
October 4, 2025: 1-1 draw away at Kyoto Sanga (90 minutes, 6.9 rating)
September 28, 2025: 4-4 draw at home vs Kashiwa Reysol (90 minutes, 1 assist, 6.9 rating)
September 23, 2025: 2-1 win away at Shonan Bellmare (89 minutes, 6.9 rating)
September 20, 2025: 0-1 loss at home vs FC Tokyo (90 minutes, 7.2 rating)
September 13, 2025: 3-0 win away at Yokohama F. Marinos (90 minutes, 1 assist, 7.2 rating)

Field Insider's view

Field Insider currently rates S. van Wermeskerken at 23.5 with a Season form score of 19.8, ranking 274th of 379 full-backs in the J1 League. See the full scout report for strengths, watch-points and the market-value outlook.

His honours include 2 career titles — among them the Super Cup. Full list in the career record.

Career

Across 12 recorded seasons, S. van Wermeskerken has totalled 267 club appearances with 5 goals and 11 assists for 5 different clubs. His busiest campaign came in 2018/19, with 38 appearances for Cambuur.

S. van Wermeskerken's career has also included time at NEC Nijmegen, Cambuur, PEC Zwolle and Dordrecht.

On the international stage, S. van Wermeskerken has represented Japan U23 — 4 caps in our records.

Transfer news

No transfer news found for this player.

Profile

Season stats

Performance data · by competition

Career

Scout report

Output in context · Kawasaki Frontale finished 8th of 20 · a mid-table side

Strengths

Watch points