Bundesliga

Kacper Potulski

Kacper Potulski, 18, from Poland ➤ 1.FSV Mainz 05, since 2025 ➤ Centre-Back ➤ Market value: €18.00m ➤ * 19/10/2007 in Gdańsk, Poland

MainzDefender - Centre-Back18 years€18.00m
Kacper Potulski

Info

Biographical card, current club and contract facts. Empty fields mean the source did not publish that value.

Club
Mainz
Position
Defender - Centre-Back
Shirt
#48
Age
18
Date of birth
19/10/2007
Height
1,95m
Foot
right
Citizenship
Poland
Joined
01/01/2026
Contract until
30/06/2028
Market value
€18.00m
Career fees
0
Youth clubs
Lechia Gdansk (2015-2021), Legia Warszawa (2021-2023), 1.FSV Mainz 05 (2023-2026)

Statistics

Career totals from Transfermarkt: this season, then by competition and by club. Minutes and cards appear when the source recorded them.

This season

SeasonCompetitionAppsMinGAYCRC
26/27Bundesliga1100000
26/27DFB-Pokal1280000

By competition

CompetitionAppsGA
Bundesliga1711
U19 Nachwuchsliga - Gr. D1410
U17-Bundesliga South/Southwest1240
Regionalliga Südwest1002
U19 Nachwuchsliga - Liga A930
Conference League800
Youth League POL800
U19-Bundesliga S/SW200
DFB-Pokal der Junioren200
DFB-Pokal100
U19-Championship101
UECL Qualifying000

By club

ClubAppsGA
Mainz 05 U192841
Mainz2511
Mainz 05 U171240
FSV Mainz 05 II1002
Legia U19800

Transfers

Recorded moves between clubs, with fee and market value on the day of the deal when the source has them.

DateSeasonFromToFeeMarket value
01/01/202625/26FSV Mainz 05 IIMainz-€2.50m
01/07/202525/26Mainz 05 U19FSV Mainz 05 II-€200k
01/07/202424/25Mainz 05 U17Mainz 05 U19--
01/07/202323/24Legia U19Mainz 05 U17free transfer-
01/11/202222/23Legia Yth.Legia U19--
01/07/202121/22Lechia YouthLegia Yth.free transfer-

National

Senior and youth national-team spells: caps, goals, shirt number and whether the player is still in the current pool.

TeamCapsGoalsShirtDebutStatus
Poland2102026-05-31Current international
Poland U212052025-09-05recent national player
Poland U19110142024-09-05Former international
Poland U1718152023-08-20Former international
Poland U169152022-08-23Former international

Market value

Current and peak Transfermarkt valuations, plus the history of changes by club and age. Rankings are relative to the current squad, league and position group.

Current
€18.00m
Highest
€18.00m · 27/05/2026
Last change
27/05/2026
Bundesliga 83Centre-Back 128Mainz 2Poland 5Worldwide 682Year 2007 21
DateAgeClubValue
11/06/2025171.FSV Mainz 05 U19€200k
19/12/2025181.FSV Mainz 05 II€2.50m
20/03/2026181.FSV Mainz 05€12.00m
27/05/2026181.FSV Mainz 05€18.00m

xG Statistics

Kacper Potulski's xG Statistics block is an Understat shot model for the 2026 season. It does not replace goals and assists — it explains them. xG and xA ask whether the chances were good enough; xGChain and xGBuildup show how often the player was on the ball in moves that became shots. Use minutes as the denominator: a large xG in 80 minutes is a hot streak, the same xG over 1,200 minutes is a role. Figures are rounded to two decimals and stay empty when Understat has no match for this player.

SeasonLeagueClubAppsMinGxGnpxGAxAShKPxGChain
2026BundesligaMainz 0529900.050.0500100.86
2025BundesligaMainz 0515106112.622.6200.621421.23

What the columns mean

Read this table as chance quality, not as a scoreboard. A player can outscore xG (finishing well) or lag behind it (missed sitters). Compare rows only when minutes are in the same range.

Apps · Appearances
Matches in which the player was used in this league season, including substitute minutes.
Min · Minutes
Total minutes on the pitch. Useful when comparing output: 1 goal in 90 minutes is not the same as 1 goal in 800.
G · Goals
Goals credited to the player in the Understat shot model for that season.
xG · Expected goals
The quality of shots the player took, expressed as the number of goals an average finisher would score from the same chances. A 0.30 xG shot is a chance that goes in about 3 times in 10.
npxG · Non-penalty xG
Expected goals with penalties removed. This is the cleaner read of open-play and set-piece finishing, because a penalty is usually ~0.76 xG by itself.
A · Assists
Goals that followed the player's last pass. Actual assists, not the model.
xA · Expected assists
The xG value of shots that came directly from the player's key passes. High xA with few assists usually means teammates missed good chances.
Sh · Shots
Total shots recorded by Understat, including blocked and off-target attempts.
KP · Key passes
Passes that led to a shot. This is the volume behind xA.
xGChain · xG chain
Team xG from possessions the player touched. It captures involvement in build-up, not only the shot or the last pass. A midfielder who starts attacks can rank high here without scoring.
xGBuildup · xG buildup
The same possession xG, but excluding the shot-taker and the assist. This is the purest 'how much did this player help create the chance before the final ball' number.
NPG · Non-penalty goals
Goals scored from open play or set pieces, excluding penalties.

Teammates