Baas's current-season form is level with last season (Season 15→14), while his Rating held around 61. His peak season for form remains 2022/23 (Season 51).

Domestic career

Season	Club	Apps	G	A	Match	RTG	Season
2025/26	Sparta Rotterdam · 10th	23	0	0	6.83	61	14
2024/25	Sparta Rotterdam · 12th	13	0	2	7.02	62	15
2024/25	Eintracht BraunschweigLoan · 16th	14	1	1	6.83	56	13
2023/24	Excelsior · 16th	33	2	2	7.09	69	46
2022/23	Excelsior · 15th	33	3	5	6.89	75	51
2021/22	Excelsior · 6th	37	2	6	6.96	60	36

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 1 earlier season in the full career.

Scout report

Squad depthDefensive midfielder

J. Baas is a 24-year-old defensive midfielder at Sparta Rotterdam, rated 60.8 overall by Field Insider's model, ranking 151st of 284 on scout potential in the Eredivisie. An emerging talent, he has been a rotation option this season (42.5% of available minutes). His defensive output reads 3.94 tackles, blocks and interceptions per 90. Below: strengths, watch-points, market-value outlook and the latest transfer news on Baas.

Judged on this season alone, Baas graded 14 — a workmanlike campaign that ranks 39th of 41 of the 41 defensive midfielders in the Eredivisie, on 0 goals, 0 assists and 3.943 defensive actions per 90.

Year-on-year, that's broadly in line with last season (Season 15 → 14). Over the 6 seasons on record his form has drifted down, peaking in 2022/23.

On long-term talent our Rating reads 61, 25th of 41 of the 41 defensive midfielders in the Eredivisie. At 24 Baas is in his prime years, and a market index of 28 reflects that trajectory.

From the career report

Read the full career report →

Past his 2022/23 peak — the recent trend is downward, so buyers are paying for what's left, not what was.

Peak: 2022/23Trending downBreakout: 2022/23Stepped up 2022/23

Current potential25th of 41 defensive midfielders · Eredivisie Current season39th of 41 defensive midfielders · Eredivisie39th-best defensive midfielder in the Eredivisie151st in the Eredivisie · potential25th-highest potential defensive midfielder in the Eredivisie

60.8

Ratingi

25th of 41 defensive midfielders

13.6

Seasoni

below regular-starter level

42.5%

Minutes

rotation minutes

3.94

Def. actions / 90

solid defensive volume

Output in context · Sparta Rotterdam finished 10th of 18 · a mid-table side

3.94

Def. / 90

Tackles

Interceptions

Clean sheets

3.94 tackles, blocks & interceptions per 90 — solid defensive volume, with 5 clean sheets across 23 appearances.

Strengths

Defensive volume. 3.94 tackles, blocks & interceptions per 90 — does the unseen work.

Watch points

Game time. Only 42.5% of available minutes — needs a settled run to prove the level.

Outlook

With a Rating of 60.8, Baas carries the 25th-highest potential of the defensive midfielders in the Eredivisie of 41. Defensively he reads as solid defensive volume (3.94 tackles, blocks & interceptions per 90). Approaching peak years; value is still building (price multiplier 2×) with the best seasons likely ahead.

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

Per 90 & availability

Minutes played %42.5%

Available fixtures34 of 34

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 903.943

Player flow

Goal involvements0

Shot conversion %0

Shot accuracy %35.7

Pass accuracy %78

Cards / 900.346

Foul involvement / 902.49

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 (~28), then tapers with age. At 24, Baas sits on 28, at or near its peak. The blue line is Baas's projected Rating — 60.8 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.