Domestic-league season · Hammarby FF.
| Competition | Apps | G | A | Min | Match |
|---|---|---|---|---|---|
 Allsvenskan | 8 | 0 | 0 | 103 | 6.88 |
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).
| Season | Club | Apps | G | A | Match | RTG | Season |
|---|---|---|---|---|---|---|---|
| 2025/26 | Hammarby FF · 2nd | 8 | 0 | 0 | 6.88 | 31 | 3 |
| 2024/25 | Sandviken · 6th | 28 | 1 | 3 | 7.01 | 32 | 16 |
Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year.
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 10.6 reflects that trajectory.
Past his 2024/25 peak — the recent trend is downward, so buyers are paying for what's left, not what was.
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.
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.
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 (~11), then tapers with age. At 22, Karlsson sits on 10.6, 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.
No transfer news found for this player.
