Premier League

Kristoffer Ajer

Kristoffer Ajer, 28, from Norway ➤ Brentford FC, since 2021 ➤ Centre-Back ➤ Market value: €22.00m ➤ * 17/04/1998 in Rælingen, Norway

BrentfordDefender - Centre-Back28 years€22.00m
Kristoffer Ajer

Info

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

Position
Defender - Centre-Back
Shirt
#20
Age
28
Date of birth
17/04/1998
Height
1,98m
Foot
right
Citizenship
Norway
Joined
21/07/2021
Contract until
30/06/2030
Market value
€22.00m
Career fees
€16.30m
Youth clubs
Rælingen FK (2004-2009), Lillestrøm SK (2009-2014)

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
26/27Premier League32700010
26/27EFL Cup000000

By competition

CompetitionAppsGA
Premiership11743
Premier League11534
Eliteserien5496
Europa League1801
SFA Cup1500
Champions League Qu.1411
Scottish Premiership Top Six Split1412
League Cup900
EFL Cup801
Europa League Qualifying610
UEFA Youth League501
FA Cup500
NM-Cup551
Challenge Cup200
Relegation Eliteserien200
Premier League Int. Cup U21110
Premier League Cup100
UEFA Champions League000

By club

ClubAppsGA
Celtic17677
Brentford12835
IK Start61147
Kilmarnock FC1700
Celtic FC YL501
Celtic U20200
Celtic B110
Brentford U21100

Transfers

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

DateSeasonFromToFeeMarket value
21/07/202121/22CelticBrentford€15.70m€7.00m
31/05/201716/17Kilmarnock FCCelticEnd of loan€800k
20/01/201716/17CelticKilmarnock FCloan transfer€800k
01/07/201616/17IK StartCeltic€600k€800k
15/07/201414/15Lillestrøm Yth.IK Start?-

National

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

TeamCapsGoalsShirtDebutStatus
Norway57232018-03-23Current international
Norway U215142017-06-12Former international
Norway U198372016-02-11Former international
Norway U173192014-10-08Former international
Norway U1810682015-10-08Former international
Norway U16121132014-01-20Former international
Norway U154092013-05-01Former 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
€22.00m
Highest
€22.00m · 22/07/2026
Last change
22/07/2026
Brentford 13Centre-Back 90Norway 9Premier League 225Worldwide 513Year 1998 33
DateAgeClubValue
07/12/201416IK Start€300k
19/08/201517IK Start€800k
27/12/201517IK Start€800k
14/02/201718Kilmarnock FC€800k
04/03/201819Celtic FC€800k
08/08/201820Celtic FC€1.25m
03/01/201920Celtic FC€2.00m
20/08/201921Celtic FC€3.00m
05/02/202021Celtic FC€3.00m
08/04/202021Celtic FC€2.70m
21/07/202022Celtic FC€4.00m
18/01/202122Celtic FC€4.00m
28/06/202123Celtic FC€7.00m
05/10/202123Brentford FC€17.00m
23/12/202123Brentford FC€17.00m
15/06/202224Brentford FC€18.00m
03/11/202224Brentford FC€16.00m
20/06/202325Brentford FC€16.00m
19/12/202325Brentford FC€18.00m
14/03/202425Brentford FC€15.00m
27/05/202426Brentford FC€15.00m
16/12/202426Brentford FC€18.00m
30/05/202527Brentford FC€18.00m
17/10/202527Brentford FC€16.00m
09/12/202527Brentford FC€16.00m
09/03/202627Brentford FC€18.00m
03/06/202628Brentford FC€18.00m
22/07/202628Brentford FC€22.00m

xG Statistics

Kristoffer Ajer'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
2026EPLBrentford327000.080.0800.05121.24
2025EPLBrentford27180901.051.0510.91055.49

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