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Kristoffer Ajer

Kristoffer Ajer

Defender - Centre-Back  at Brentford FC
Age28
CitizenshipNorway
Height1.98 m
Footright
BornApril 17, 1998
at Brentford FC 1,768 days · joined 2021-07-21
👕200+ Apps 🏴50+ Caps
Market value €18.00m
Centre-Back Defender

Career snapshot

7
clubs played for
16/17
debut season
0.07
goals / match
Celtic FC
top club · 176 apps

Career highs

€18.00m
peak value · 2022
€15.70m
top transfer fee · 21/22
12
best season · 2015
82 / 12
int'l caps / goals
358Appearances
24Goals
19Assists
48Yellow cards
1Red cards
96Full matches (90′)
Full nameKristoffer Ajer
Name in home countryKristoffer Vassbakk Köpp Ajer
Date of birth1998-04-17 (28 yrs)
Place of birthRælingen, Norway
CitizenshipNorway
PositionDefender - Centre-Back (main: Defender)
Footright
Height198.00 m
Current clubBrentford FC
Joined2021-07-21
Contract expires2028-06-30
AgentWasserman
Jul 2025
25/26 — Brentford FC
2 matches · 0 G · 1 A · across 2 competitions
Dec 2024
Injury: unknown
7 games missed
Oct 2024
Injury: unknown
11 games missed
Aug 2024
Injury: unknown
4 games missed
Jul 2024
24/25 — Brentford FC
25 matches · 0 G · 0 A · across 2 competitions
Apr 2024
Injury: unknown
3 games missed
Dec 2023
Injury: unknown
8 games missed
Jul 2023
23/24 — Brentford FC
31 matches · 2 G · 1 A · across 3 competitions
Jul 2022
Injury: unknown
6 games missed
Jul 2022
22/23 — Brentford FC, FC Brentford U21
11 matches · 0 G · 0 A · across 3 competitions
Jul 2021
Transfer: Celtic → Brentford
21/22 · Transfer · €15.70m
Jul 2021
21/22 — Brentford FC
28 matches · 1 G · 2 A · across 3 competitions
Jan 2021
Injury: unknown
2 games missed
Oct 2020
Injury: unknown
3 games missed
Jul 2020
20/21 — Celtic FC
46 matches · 2 G · 4 A · across 7 competitions
Jan 2020
Injury: unknown
2 games missed
Aug 2019
Injury: unknown
4 games missed
Aug 2019
Injury: unknown
1 games missed
Jul 2019
19/20 — Celtic FC
50 matches · 4 G · 2 A · across 6 competitions
Nov 2018
Injury: unknown
9 games missed
Sep 2018
Injury: unknown
9 games missed
Sep 2018
Injury: unknown
1 games missed
Jul 2018
18/19 — Celtic FC
45 matches · 1 G · 1 A · across 7 competitions
Jul 2017
17/18 — Celtic FC
34 matches · 0 G · 0 A · across 7 competitions
May 2017
Transfer: Kilmarnock FC → Celtic
16/17 · Return from loan
Jan 2017
Transfer: Celtic → Kilmarnock FC
16/17 · Loan
Jul 2016
Injury: unknown
1 games missed
Jul 2016
16/17 — Celtic FC, Celtic Glasgow U20, Kilmarnock FC, Celtic FC UEFA U19
25 matches · 0 G · 1 A · across 5 competitions
Jul 2016
2016 — IK Start
14 matches · 1 G · 2 A · across 2 competitions
Jul 2016
Transfer: Start → Celtic
16/17 · Transfer · €600k
Jul 2015
2015 — IK Start
34 matches · 12 G · 4 A · across 3 competitions
Jul 2014
Transfer: Lillestrøm Yth. → Start
14/15 · Transfer
Jul 2014
2014 — IK Start
13 matches · 1 G · 1 A · across 2 competitions
Jan 1970
Peak market value: €18.00m
Highest valuation recorded in dataset
8,645 min
Minutes played by club
Brentford FC 33.6%
FC Brentford U21 0.0%
IK Start 14.3%
Celtic FC 52.2%
Kilmarnock FC 0.0%
Celtic Glasgow U20 0.0%
Celtic FC UEFA U19 0.0%
ClubSeasonsFirstLastMatchesGoalsAssistsMinutes
Brentford FC 5 21/22 25/26 96 3 4 2,904
FC Brentford U21 1 22/23 22/23 1 0 0 0
IK Start 3 2014 2016 61 14 7 1,232
Celtic FC 5 16/17 20/21 176 7 7 4,509
Kilmarnock FC 1 16/17 16/17 17 0 0 0
Celtic Glasgow U20 1 16/17 16/17 2 0 0 0
Celtic FC UEFA U19 1 16/17 16/17 5 0 1 0

Career trajectory — goals, assists & market value

4€4.5M8€9M12€13.5M16€18M16/17 — 1 assists116/1717/1818/19 — 1 goals (Celtic FC)18/19 — 1 assists218/1919/20 — 4 goals (Celtic FC)19/20 — 2 assists619/2020/21 — 2 goals (Celtic FC)20/21 — 4 assists620/212014 — 1 goals (IK Start)2014 — 1 assists220142015 — 12 goals (IK Start)2015 — 4 assists1620152016 — 1 goals (IK Start)2016 — 2 assists3201621/22 — 1 goals (Brentford FC)21/22 — 2 assists321/2222/2323/24 — 2 goals (Brentford FC)23/24 — 1 assists323/2424/2525/26 — 1 assists125/2617/18 — €800K18/19 — €1.3M19/20 — €3M20/21 — €4M21/22 — €17M22/23 — €18M23/24 — €18M24/25 — €18M25/26 — €18MGoalsAssistsMarket value

Goals by season

16/17: 0016/1717/18: 0017/1818/19: 1118/1919/20: 4419/2020/21: 2220/212014: 1120142015: 121220152016: 11201621/22: 1121/2222/23: 0022/2323/24: 2223/2424/25: 0024/2525/26: 0025/26

Assists by season

16/17: 1116/1717/18: 0017/1818/19: 1118/1919/20: 2219/2020/21: 4420/212014: 1120142015: 4420152016: 22201621/22: 2221/2222/23: 0022/2323/24: 1123/2424/25: 0024/2525/26: 1125/26
SeasonCompetitionClubMatchesGoalsAssistsYCRCMinutes
25/26 EFL Cup Brentford FC 1 0 1 0 0 0
25/26 Premier League Brentford FC 1 0 0 0 0 0
24/25 EFL Cup Brentford FC 1 0 0 0 0 0
24/25 Premier League Brentford FC 24 0 0 5 0 0
23/24 EFL Cup Brentford FC 2 0 0 0 0 0
23/24 FA Cup Brentford FC 1 0 0 0 0 0
23/24 Premier League Brentford FC 28 2 1 5 0 917
22/23 FA Cup Brentford FC 1 0 0 0 0 0
22/23 Premier League Brentford FC 9 0 0 0 0 0
22/23 Premier League Cup FC Brentford U21 1 0 0 0 0 0
21/22 EFL Cup Brentford FC 2 0 0 0 0 0
21/22 FA Cup Brentford FC 2 0 0 0 0 0
21/22 Premier League Brentford FC 24 1 2 5 0 1,987
2016 NM-Cup IK Start 3 1 1 0 0 270
2016 Tippeligaen IK Start 11 0 1 4 0 0
2015 NM-Cup IK Start 2 4 0 1 0 34
2015 Relegation Eliteserien IK Start 2 0 0 0 0 0
2015 Tippeligaen IK Start 30 8 4 2 0 323
2014 NM-Cup IK Start 0 0 0 0 0 0
2014 Tippeligaen IK Start 13 1 1 1 0 605
20/21 Betfred Cup Celtic FC 1 0 0 0 0 0
20/21 Champions League Qu. Celtic FC 1 0 0 0 0 0
20/21 Europa League Celtic FC 5 0 1 0 0 0
20/21 Europa League Qualifying Celtic FC 2 0 0 0 0 0
20/21 Premiership Celtic FC 31 1 1 1 0 2,683
20/21 Scottish Premiership Top Six Split Celtic FC 4 1 2 0 0 360
20/21 SFA Cup Celtic FC 2 0 0 0 0 0
19/20 Betfred Cup Celtic FC 4 0 0 1 0 0
19/20 Champions League Qu. Celtic FC 5 1 0 1 0 450
19/20 Europa League Celtic FC 8 0 0 2 0 0
19/20 Europa League Qualifying Celtic FC 2 0 0 0 0 0
19/20 Premiership Celtic FC 28 3 2 3 0 836
19/20 SFA Cup Celtic FC 3 0 0 1 0 0
18/19 Betfred Cup Celtic FC 3 0 0 0 0 0
18/19 Champions League Qu. Celtic FC 5 0 1 2 0 0
18/19 Europa League Celtic FC 3 0 0 0 0 0
18/19 Europa League Qualifying Celtic FC 2 1 0 0 0 180
18/19 Premiership Celtic FC 23 0 0 3 1 0
18/19 Scottish Premiership Top Six Split Celtic FC 5 0 0 3 0 0
18/19 SFA Cup Celtic FC 4 0 0 0 0 0
17/18 Betfred Cup Celtic FC 1 0 0 0 0 0
17/18 Champions League Celtic FC 0 0 0 0 0 0
17/18 Champions League Qu. Celtic FC 2 0 0 1 0 0
17/18 Europa League Celtic FC 2 0 0 0 0 0
17/18 Premiership Celtic FC 19 0 0 2 0 0
17/18 Scottish Premiership Top Six Split Celtic FC 5 0 0 1 0 0
17/18 SFA Cup Celtic FC 5 0 0 0 0 0
16/17 Champions League Qu. Celtic FC 1 0 0 0 0 0
16/17 Irn-Bru Cup Celtic Glasgow U20 2 0 0 0 0 0
16/17 Premiership Kilmarnock FC 16 0 0 2 0 0
16/17 SFA Cup Kilmarnock FC 1 0 0 0 0 0
16/17 UEFA Youth League Celtic FC UEFA U19 5 0 1 2 0 0
SeasonDateFromToTypeMarket valueFee
14/15 2014-07-15 Lillestrøm Yth. Start Transfer 0
16/17 2016-07-01 Start Celtic Transfer 800000 €600k
16/17 2017-01-20 Celtic Kilmarnock FC Loan 800000
16/17 2017-05-31 Kilmarnock FC Celtic Return from loan 800000
21/22 2021-07-21 Celtic Brentford Transfer 7000000 €15.70m
SeasonInjuryFromToDays missedGames missed
16/17 Knee injury 2016-07-22 2016-08-01 11 1
18/19 Virus 2018-09-18 2018-09-22 5 1
18/19 Hamstring injury 2018-09-22 2018-10-27 36 9
18/19 Eyebow fracture 2018-11-11 2018-12-15 35 9
19/20 Groin problems 2019-08-29 2019-08-30 2 1
19/20 Knee problems 2019-08-29 2019-09-12 15 4
19/20 Virus 2020-01-25 2020-01-29 5 2
20/21 Groin injury 2020-10-29 2020-11-07 10 3
20/21 Quarantine 2021-01-09 2021-01-19 11 2
21/22 Hamstring injury 2022-07-09 2022-08-31 54 6
23/24 Foot injury 2023-12-02 2024-01-16 46 8
23/24 Calf strain 2024-04-06 2024-04-20 15 3
24/25 Ankle injury 2024-08-31 2024-09-14 15 4
24/25 Foot injury 2024-10-19 2024-12-07 50 11
24/25 Ankle injury 2024-12-21 2025-01-25 36 7
Current€18.00m
Peak€18.00m
Low€300k
Δ since start+€17.70m
€300k€4.73m€9.15m€13.58m€18.00m197019701970
DateValue
Jan 1, 1970 €18.00m
Jan 1, 1970 €15.00m
Jan 1, 1970 €18.00m
Jan 1, 1970 €15.00m
Jan 1, 1970 €18.00m
Jan 1, 1970 €16.00m
Jan 1, 1970 €18.00m
Jan 1, 1970 €16.00m
Jan 1, 1970 €17.00m
Jan 1, 1970 €4.00m
Jan 1, 1970 €17.00m
Jan 1, 1970 €7.00m
Jan 1, 1970 €4.00m
Jan 1, 1970 €2.70m
Jan 1, 1970 €3.00m
Jan 1, 1970 €3.00m
Jan 1, 1970 €2.00m
Jan 1, 1970 €1.25m
Jan 1, 1970 €800k
Jan 1, 1970 €800k
Jan 1, 1970 €800k
Jan 1, 1970 €800k
Jan 1, 1970 €300k
TeamShirtMatchesGoalsDebutAge at debutStatus
Team #38018 #9 4 0 former national player
Team #36495 #13 12 1 former national player
Team #31919 10 6 former national player
Team #26471 #9 1 1 former national player
Team #22515 #7 5 1 former national player
Team #16854 5 1 former national player
Team #3440 #3 45 2 current national player

Single-season peaks across competitions in this player's career.

Top goalscoring seasons

SeasonCompetitionClubGoalsMatches
2015 Tippeligaen IK Start 8 30
2015 NM-Cup IK Start 4 2
19/20 Premiership Celtic FC 3 28

Top assist seasons

SeasonCompetitionClubAssistsMatches
2015 Tippeligaen IK Start 4 30
20/21 Scottish Premiership Top Six Split Celtic FC 2 4
19/20 Premiership Celtic FC 2 28

Every loan spell across this player's career.

SeasonDateFromToTypeFeeValue at transfer
16/17 2017-05-31 Kilmarnock FC Celtic Return from loan €800k
16/17 2017-01-20 Celtic Kilmarnock FC Loan €800k

Last 50 matches for Brentford FC The Availability column cross-references our injury database — matches inside a known injury window are flagged INJURED. Per-match goal attribution requires a paid feed (FBref/Sofascore) and isn't wired up yet.

DateCompHomeScoreAwayAvailability
2026-05-24 GB1 Liverpool FC 1–1 Brentford FC Available
2026-05-17 GB1 Brentford FC Crystal Palace FC TIMED
2026-05-09 GB1 Manchester City FC 3–0 Brentford FC Available
2026-05-09 GB1 Manchester City FC 3–0 Brentford FC Available
2026-05-02 GB1 Brentford FC 3–0 West Ham United FC Available
2026-05-02 GB1 Brentford FC 3–0 West Ham United FC Available
2026-04-27 GB1 Manchester United FC 2–1 Brentford FC Available
2026-04-27 GB1 Manchester United FC 2–1 Brentford FC Available
2026-04-18 GB1 Brentford FC 0–0 Fulham FC Available
2026-04-18 GB1 Brentford FC 0–0 Fulham FC Available
2026-04-11 GB1 Brentford FC 2–2 Everton FC Available
2026-03-21 GB1 Leeds United FC 0–0 Brentford FC Available
2026-03-16 GB1 Brentford FC 2–2 Wolverhampton Wanderers FC Available
2026-03-03 GB1 AFC Bournemouth 0–0 Brentford FC Available
2026-02-28 GB1 Burnley FC 3–4 Brentford FC Available
2026-02-21 GB1 Brentford FC 0–2 Brighton & Hove Albion FC Available
2026-02-12 GB1 Brentford FC 1–1 Arsenal FC Available
2026-02-07 GB1 Newcastle United FC 2–3 Brentford FC Available
2026-02-01 GB1 Aston Villa FC 0–1 Brentford FC Available
2026-01-25 GB1 Brentford FC 0–2 Nottingham Forest FC Available
2026-01-17 GB1 Chelsea FC 2–0 Brentford FC Available
2026-01-07 GB1 Brentford FC 3–0 Sunderland AFC Available
2026-01-04 GB1 Everton FC 2–4 Brentford FC Available
2026-01-01 GB1 Brentford FC 0–0 Tottenham Hotspur FC Available
2025-12-27 GB1 Brentford FC 4–1 AFC Bournemouth Available
2025-12-20 GB1 Wolverhampton Wanderers FC 0–2 Brentford FC Available
2025-12-14 GB1 Brentford FC 1–1 Leeds United FC Available
2025-12-06 GB1 Tottenham Hotspur FC 2–0 Brentford FC Available
2025-12-03 GB1 Arsenal FC 2–0 Brentford FC Available
2025-11-29 GB1 Brentford FC 3–1 Burnley FC Available
2025-11-22 GB1 Brighton & Hove Albion FC 2–1 Brentford FC Available
2025-11-09 GB1 Brentford FC 3–1 Newcastle United FC Available
2025-11-01 GB1 Crystal Palace FC 2–0 Brentford FC Available
2025-10-25 GB1 Brentford FC 3–2 Liverpool FC Available
2025-10-20 GB1 West Ham United FC 0–2 Brentford FC Available
2025-10-05 GB1 Brentford FC 0–1 Manchester City FC Available
2025-09-27 GB1 Brentford FC 3–1 Manchester United FC Available
2025-09-20 GB1 Fulham FC 3–1 Brentford FC Available
2025-09-13 GB1 Brentford FC 2–2 Chelsea FC Available
2025-08-30 GB1 Sunderland AFC 2–1 Brentford FC Available
2025-08-23 GB1 Brentford FC 1–0 Aston Villa FC Available
2025-08-17 GB1 Nottingham Forest FC 3–1 Brentford FC Available
2025-05-25 GB1 Wolverhampton Wanderers FC 1–1 Brentford FC Available
2025-05-18 GB1 Brentford FC 2–3 Fulham FC Available
2025-05-10 GB1 Ipswich Town FC 0–1 Brentford FC Available
2025-05-04 GB1 Brentford FC 4–3 Manchester United FC Available
2025-05-01 GB1 Nottingham Forest FC 0–2 Brentford FC Available
2025-04-19 GB1 Brentford FC 4–2 Brighton & Hove Albion FC Available
2025-04-12 GB1 Arsenal FC 1–1 Brentford FC Available
2025-04-06 GB1 Brentford FC 0–0 Chelsea FC Available

Teams faced most often by Kristoffer Ajer's clubs during seasons he played in those competitions (team-level results, not personal head-to-head goals — see disclaimer above).

OpponentPWDLGFGAGDWin %
Kilmarnock FC 13 9 2 2 33 11 +22 69%
St. Mirren FC 13 11 1 1 33 7 +26 85%
Motherwell FC 12 10 2 0 34 9 +25 83%
Livingston FC 12 6 5 1 22 9 +13 50%
Rangers FC 12 6 2 4 15 13 +2 50%
Aberdeen FC 11 9 2 0 28 10 +18 82%
Hibernian FC 11 6 4 1 21 10 +11 55%
St. Johnstone FC 11 9 2 0 31 4 +27 82%
Heart of Midlothian 10 7 0 3 24 8 +16 70%
Ross County FC 9 8 0 1 28 4 +24 89%
Hamilton Academical 9 9 0 0 24 3 +21 100%
Dundee FC 7 7 0 0 24 2 +22 100%

Auto-detected milestones based on cumulative career totals.

Season / YearMilestoneDate
16/17 Senior debut season
18/19 First senior goal

Yellow / second-yellow / red cards per season. Only seasons with at least one card are shown.

SeasonMatchesMinsYC2nd YCRCCards / 90′
24/25 25 0 5 0 0 0
23/24 31 917 5 0 0 0.49
21/22 28 1,987 5 0 0 0.23
2016 14 270 4 0 0 1.33
2015 34 357 3 0 0 0.76
2014 13 605 1 0 0 0.15
20/21 46 3,043 1 0 0 0.03
19/20 50 1,286 8 0 0 0.56
18/19 45 180 8 0 1 4.5
17/18 34 0 4 0 0 0
16/17 25 0 4 0 0 0

Output by competition

Career goals and assists broken down by tournament.

Tippeligaen
54 apps
9 G
6 A
NM-Cup
5 apps
5 G
1 A
Premiership
117 apps
4 G
3 A
Premier League
86 apps
3 G
3 A
Scottish Premiership Top Six Split
14 apps
1 G
2 A
Champions League Qu.
14 apps
1 G
1 A
Europa League Qualifying
6 apps
1 G
0 A
EFL Cup
6 apps
0 G
1 A
Europa League
18 apps
0 G
1 A
UEFA Youth League
5 apps
0 G
1 A

Frequently asked about Kristoffer Ajer

Who is Kristoffer Ajer?

Kristoffer Ajer is a Norway professional footballer who plays as a centre-back for Brentford FC.

How old is Kristoffer Ajer?

Kristoffer Ajer is 28 years old. He was born on April 17, 1998 in Rælingen.

What position does Kristoffer Ajer play?

Kristoffer Ajer plays as a centre-back (Defender - Centre-Back).

What club does Kristoffer Ajer play for?

Kristoffer Ajer currently plays for Brentford FC.

How many career goals has Kristoffer Ajer scored?

Across all senior club competitions in our dataset, Kristoffer Ajer has scored 24 goals in 358 appearances.

What is Kristoffer Ajer's market value?

Kristoffer Ajer's most recent reported market value is €18.00m.