JZ
Poland·DEF·#24

Jan Ziółkowski

AR
AS Roma · Serie A
Onside Valuation
€12.4M
-0.3Mthis week
90% confidence · €10.7M–€13.6M
12-month history

Valuation trajectory

12
Jul
11
Aug
13
Sep
13
Oct
13
Nov
13
Dec
12
Jan
11
Feb
12
Mar
13
Apr
13
May
13
Jun

Onside model estimate. Values are derived from the methodology, not a market quote.

What drives the value

Valuation pillars

On-field
56
Output
20
Minutes
15
League
90
Age curve
100
Comparable value + position

Similar players

RN
Ruan Tressoldi Netto
Atletico-MG
€12.9M
AC
Alexander William Cochrane
Birmingham
€13.0M
AR
Antonio Rüdiger
Real Madrid
€13.2M
WH
Wesley Theodorus Hoedt
Al Shabab
€13.5M
JF
Jair Paula da Cunha Filho
Nottingham Forest
€10.9M
EB
Eric Bertrand Bailly
Oviedo
€14.0M

Key facts

Age20 years
PositionDEF
Foot—
Height194 cm
NationalityPoland
Confidence90%
Value range€10.7M–€13.6M

Season 2025/266.81

18
Apps
527
Minutes
0
Goals
0
Assists

Compare