J. Karlsson

Following his move to Hammarby FF, Karlsson's current-season form is down 81% on last season (Season 16→3), while his Rating held around 31. His peak season for form remains 2024/25 (Season 16).

Domestic career

Season	Club	Apps	G	A	Match	RTG	Season
2026/27	Vasteras SK FK	12	0	0	6.74	—	—
2025/26	Hammarby FF · 2nd	8	0	0	6.88	31	3
2024/25	Hammarby FF	3	0	0	—	—	—
2024/25	Sandviken · 6th	28	1	3	7.01	32	16
2023/24	Stockholm Internazionale	29	2	0	—	—	—

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year.

Scout report

Squad depthBall-winning Full-back

J. Karlsson is a 22-year-old full-back at Hammarby FF, rated 31.1 overall by Field Insider's model. An emerging talent, he has been a fringe squad member this season (3.8% of available minutes). His defensive output reads 4.37 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Karlsson.

On the season, Karlsson graded 3 for current form (age-blind), on 1 clean sheet and 4.369 defensive actions per 90.

Year-on-year, that's a drop on last season (Season 16 → 3).

On long-term talent our Rating reads 31. At 22 Karlsson is still climbing toward his ceiling, and a market index of 3.8 reflects that trajectory.

From the career report

Read the full career report →

Past his 2024/25 peak — the recent trend is downward, so buyers are paying for what's left, not what was.

Peak: 2024/25Trending downStepped up 2025/26

31.1

Ratingi

below regular-starter level

3.1

Seasoni

below regular-starter level

3.8%

Minutes

limited game time

4.37

Def. actions / 90

solid defensive volume

Output in context · Hammarby FF finished 2nd of 16 · a title-challenging side

4.37

Def. / 90

Tackles

—

Interceptions

Clean sheets

4.37 tackles, blocks & interceptions per 90 — solid defensive volume, with 1 clean sheet across 8 appearances. Behind a title-challenging side (2nd of 16) 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.

Strengths

Defensive volume. 4.37 tackles, blocks & interceptions per 90 — does the unseen work.

Watch points

Game time. Only 3.8% of available minutes — needs a settled run to prove the level.
Level. Rates below a nailed-on top-tier starter on our model.

Outlook

Rated 31.1 overall — below regular-starter level. Defensively he reads as solid defensive volume (4.37 tackles, blocks & interceptions per 90). Approaching peak years; value is still building (price multiplier 1.9×) with the best seasons likely ahead.

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

Per 90 & availability

Minutes played %3.8%

Available fixtures30 of 30

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 904.369

Player flow

Goal involvements0

Dribble success %25

Cards / 900

Foul involvement / 904.369

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 (~4), then tapers with age. At 22, Karlsson sits on 3.8, still climbing toward its peak. The blue line is Karlsson's projected Rating — 31.1 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.