J. Słowik

Following his move to Yokohama FC, Słowik's current-season form is level with last season (Season 10→12), while his Rating eased 21→11. His peak season for form remains 2022/23 (Season 47).

Domestic career

Season	Club	Apps	CS	CS%	Match	RTG	Season
2025/26	Yokohama FC · 18th	12	4	33%	6.92	11	12
2024/25	Konyaspor · 11th	24	5	21%	7.08	21	10
2023/24	Konyaspor · 16th	14	4	29%	6.96	20	10
2023/24	FC Tokyo · 11th	22	6	27%	6.8	26	16
2022/23	FC Tokyo · 6th	29	12	41%	6.77	34	47
2021/22	Vegalta Sendai · 19th	37	7	19%	6.75	37	11

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 11 earlier seasons in the full career.

Poland · international

Side	Apps	G
Poland	1	0

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

Scout report

Experienced headGoalkeeper

J. Słowik is a 34-year-old goalkeeper at Yokohama FC, enjoying a standout season — 0 goals and 0 assists in 12 appearances, a Season grade of 12, top 55% of J1 League goalkeepers. On long-term scout potential he's rated 11.1, ranking 357th of 377 in the J1 League. A seasoned veteran, he has been a fringe squad member (31.6% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Słowik.

Judged on this season alone, Słowik graded 12 — a workmanlike campaign that ranks 17th of 31 of the 31 goalkeepers in the J1 League, on 4 clean sheets across 12 appearances.

Year-on-year, that's broadly in line with last season (Season 10 → 12). Over the 6 seasons on record his form has held fairly steady, peaking in 2022/23.

On long-term talent our Rating reads 11, 26th of 31 of the 31 goalkeepers in the J1 League. At 34 Słowik is into the veteran stage, where the age curve weighs on the projection, and a market index of 1.5 reflects that trajectory.

From the career report

Read the full career report →

Below his 2022/23 peak but holding a solid level — the platform for a return is there.

Peak: 2022/23Holding levelBreakout: 2022/234 clubs

Current potential26th of 31 goalkeepers · J1 League · 12 apps Current season17th of 31 goalkeepers · J1 League · 12 apps17th-best goalkeeper in the J1 League357th in the J1 League · potential26th-highest potential goalkeeper in the J1 League

11.1

Ratingi

26th of 31 goalkeepers

11.6

Seasoni

below regular-starter level

31.6%

Minutes

limited game time

Def. actions / 90

light defensive volume

Output in context · Yokohama FC finished 18th of 20 · a relegation-threatened side

Apps

Clean sheets

33%

CS rate

31.6%

Minutes

4 clean sheets in 12 appearances (33% of games). Keeping that many behind a relegation-threatened side (18th of 20) — a side that concedes more — points to a busy, productive season between the posts.

Watch points

Game time. Only 31.6% of available minutes — needs a settled run to prove the level.
Age curve. At 34, 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 11.1, Słowik carries the 26th-highest potential of the goalkeepers in the J1 League of 31 — though on just 12 appearances this season, so the standing rests on a small sample. A limited game time keeper carrying the gloves this season. Veteran phase — a short-term, lower-fee proposition as both level and value decline (0.6× and falling).

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

Per 90 & availability

Minutes played %31.6%

Available fixtures38 of 38

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 900

Player flow

Goal involvements0

Cards / 900.25

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 (~5), then tapers with age. At 34, Słowik sits on 1.5, past its peak and easing. The blue line is Słowik's projected Rating — 11.1 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.