Brentford FC· Premier LeagueAjer has won three Scottish Premiership titles, three Scottish Cups, and three Scottish League Cups with Celtic, as well as a Premier League Cup with Brentford. He has also represented Norway at the international level.
Kristoffer Ajer is a Norwegian centre-back who began his professional career at Start before moving to Celtic in 2016, where he won multiple domestic trophies. He joined Brentford in 2021 and has since established himself as a key defender in the Premier League. Ajer has also earned caps for the Norwegian national team.
Ajer is a tall, physically imposing defender who excels in aerial duels and is comfortable playing out from the back. His strength and composure make him effective in both defensive and build-up phases, though his pace can occasionally be exposed against quicker attackers. He is primarily a centre-back but has also been deployed as a defensive midfielder.
| Season | Comp | Apps | G | A | YC | RC | Min |
|---|---|---|---|---|---|---|---|
| 25/26 | Premier League | 27 | 0 | 1 | 4 | 0 | 1809 |
| 25/26 | International Friendlies | 5 | 0 | 0 | 1 | 0 | 390 |
| 25/26 | FA Cup | 1 | 0 | 0 | 0 | 0 | 97 |
| 25/26 | EFL Cup | 3 | 0 | 1 | 0 | 0 | 232 |
| 24/25 | UEFA Nations League B | 2 | 0 | 0 | 0 | 0 | 180 |
| 24/25 | Premier League | 24 | 0 | 0 | 5 | 0 | 1443 |
| 24/25 | FA Cup | 0 | 0 | 0 | 0 | 0 | 0 |
| 24/25 | EFL Cup | 1 | 0 | 0 | 0 | 0 | 90 |
| 23/24 | Premier League | 28 | 2 | 1 | 5 | 0 | 1833 |
| 23/24 | International Friendlies | 6 | 1 | 0 | 1 | 0 | 540 |
| 23/24 | FA Cup | 1 | 0 | 0 | 0 | 0 | 62 |
| 23/24 | EFL Cup | 2 | 0 | 0 | 0 | 0 | 98 |
| 22/23 | UEFA Nations League B | 1 | 0 | 0 | 0 | 0 | 32 |
| 22/23 | Premier League | 9 | 0 | 0 | 0 | 0 | 766 |
| 22/23 | International Friendlies | 0 | 0 | 0 | 0 | 0 | 0 |
| 22/23 | FA Cup | 1 | 0 | 0 | 0 | 0 | 80 |
| 22/23 | European Qualifiers | 4 | 0 | 0 | 1 | 0 | 283 |
| 22/23 | EFL Cup | 0 | 0 | 0 | 0 | 0 | 0 |
| 22/23 | Premier League Cup | 1 | 0 | 0 | 0 | 0 | 90 |
| 21/22 | Premier League | 24 | 1 | 2 | 5 | 0 | 1987 |
| 21/22 | International Friendlies | 1 | 0 | 0 | 0 | 0 | 90 |
| 21/22 | FA Cup | 2 | 0 | 0 | 0 | 0 | 152 |
| 21/22 | UEFA Champions League Qualifying | 0 | 0 | 0 | 0 | 0 | 0 |
| 21/22 | EFL Cup | 2 | 0 | 0 | 0 | 0 | 135 |
| 2025 | World Cup Qualifiers (Europe) | 8 | 1 | 0 | 1 | 0 | 703 |
| 2021 | World Cup Qualifiers (Europe) | 4 | 0 | 0 | 0 | 0 | 360 |
| 2016 | NM-Cup | 3 | 1 | 1 | 0 | 0 | 270 |
| 2016 | Eliteserien | 11 | 0 | 1 | 4 | 0 | 934 |
| 2015 | Relegation Eliteserien | 2 | 0 | 0 | 0 | 0 | 180 |
| 2015 | NM-Cup | 2 | 4 | 0 | 1 | 0 | 135 |
| 2015 | Eliteserien | 30 | 8 | 4 | 2 | 0 | 2582 |
| 2014 | NM-Cup | 0 | 0 | 0 | 0 | 0 | 0 |
| 2014 | Eliteserien | 13 | 1 | 1 | 1 | 0 | 605 |
| 20/21 | UEFA Nations League B | 4 | 0 | 0 | 0 | 0 | 360 |
| 20/21 | Scottish FA Cup | 2 | 0 | 0 | 0 | 0 | 180 |
| 20/21 | Scottish Premiership Top Six Split | 4 | 1 | 2 | 0 | 0 | 360 |
| 20/21 | Scottish League Cup | 1 | 0 | 0 | 0 | 0 | 90 |
| 20/21 | Scottish Premiership | 31 | 1 | 1 | 1 | 0 | 2683 |
| 20/21 | International Friendlies | 2 | 0 | 0 | 0 | 0 | 160 |
| 20/21 | UEFA Europa League Qualifying | 2 | 0 | 0 | 0 | 0 | 180 |
| 20/21 | UEFA Europa League | 5 | 0 | 1 | 0 | 0 | 410 |
| 20/21 | UEFA Champions League Qualifying | 1 | 0 | 0 | 0 | 0 | 90 |
| 19/20 | Scottish FA Cup | 3 | 0 | 0 | 1 | 0 | 300 |
| 19/20 | Scottish League Cup | 4 | 0 | 0 | 1 | 0 | 346 |
| 19/20 | Scottish Premiership | 28 | 3 | 2 | 3 | 0 | 2508 |
| 19/20 | European Qualifiers Play-offs | 1 | 0 | 0 | 0 | 0 | 120 |
| 19/20 | UEFA Europa League Qualifying | 2 | 0 | 0 | 0 | 0 | 105 |
| 19/20 | UEFA Europa League | 8 | 0 | 0 | 2 | 0 | 675 |
| 19/20 | UEFA Champions League Qualifying | 5 | 1 | 0 | 1 | 0 | 450 |
| 18/19 | UEFA Nations League C | 2 | 0 | 0 | 0 | 0 | 180 |
| 18/19 | Scottish FA Cup | 4 | 0 | 0 | 0 | 0 | 315 |
| 18/19 | Scottish Premiership Top Six Split | 5 | 0 | 0 | 3 | 0 | 450 |
| 18/19 | Scottish League Cup | 3 | 0 | 0 | 0 | 0 | 203 |
| 18/19 | Scottish Premiership | 23 | 0 | 0 | 3 | 1 | 1715 |
| 18/19 | European Qualifiers | 8 | 0 | 0 | 1 | 0 | 720 |
| 18/19 | UEFA Europa League Qualifying | 2 | 1 | 0 | 0 | 0 | 180 |
| 18/19 | UEFA Europa League | 3 | 0 | 0 | 0 | 0 | 160 |
| 18/19 | UEFA Champions League Qualifying | 5 | 0 | 1 | 2 | 0 | 450 |
| 17/18 | UEFA European Under-21 Championship Qualifying | 5 | 1 | 0 | 2 | 0 | 450 |
| 17/18 | Scottish FA Cup | 5 | 0 | 0 | 0 | 0 | 436 |
| 17/18 | Scottish Premiership Top Six Split | 5 | 0 | 0 | 1 | 0 | 450 |
| 17/18 | Scottish League Cup | 1 | 0 | 0 | 0 | 0 | 90 |
| 17/18 | Scottish Premiership | 19 | 0 | 0 | 2 | 0 | 1575 |
| 17/18 | International Friendlies | 4 | 0 | 0 | 1 | 0 | 360 |
| 17/18 | UEFA Europa League | 2 | 0 | 0 | 0 | 0 | 180 |
| 17/18 | UEFA Champions League Qualifying | 2 | 0 | 0 | 1 | 0 | 180 |
| 17/18 | UEFA Champions League | 0 | 0 | 0 | 0 | 0 | 0 |
| 16/17 | UEFA EURO U19 Championship Qualifiers | 6 | 3 | 0 | 0 | 0 | 513 |
| 16/17 | Scottish Challenge Cup | 2 | 0 | 0 | 0 | 0 | 180 |
| 16/17 | Scottish FA Cup | 1 | 0 | 0 | 0 | 0 | 90 |
| 16/17 | Scottish League Cup | 0 | 0 | 0 | 0 | 0 | 0 |
| 16/17 | Scottish Premiership | 16 | 0 | 0 | 2 | 0 | 1440 |
| 16/17 | Premier League International Cup U21 | 1 | 1 | 0 | 0 | 0 | 90 |
| 16/17 | International Friendlies | 1 | 1 | 0 | 1 | 0 | 83 |
| 16/17 | UEFA Champions League Qualifying | 1 | 0 | 0 | 0 | 0 | 30 |
| 16/17 | UEFA Champions League | 0 | 0 | 0 | 0 | 0 | 0 |
| 16/17 | UEFA Youth League | 5 | 0 | 1 | 2 | 0 | 450 |
| 15/16 | International Friendlies | 4 | 1 | 0 | 0 | 0 | 295 |
| 14/15 | UEFA European Under-17 Championship qualification | 2 | 1 | 0 | 2 | 0 | 160 |
| 14/15 | International Friendlies | 4 | 0 | 0 | 1 | 0 | 250 |
| 13/14 | International Friendlies | 3 | 0 | 0 | 0 | 0 | 200 |
| Date | Opponent | H/A | Result | Competition | Min | G | A | YC |
|---|---|---|---|---|---|---|---|---|
| 2026-06-07 | Norway | ✈ | 1:1 | International Friendlies | 72 | 0 | 0 | 0 |
| 2026-06-01 | Sweden | 🏠 | 3:1 | International Friendlies | 63 | 0 | 0 | 0 |
| 2026-03-31 | Switzerland | 🏠 | 0:0 | International Friendlies | 75 | 0 | 0 | 0 |
| 2026-03-27 | Norway | ✈ | 2:1 | International Friendlies | 90 | 0 | 0 | 1 |
| 2025-11-16 | Norway | ✈ | 1:4 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2025-11-13 | Estonia | 🏠 | 4:1 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2025-10-14 | New Zealand | 🏠 | 1:1 | International Friendlies | - | 0 | 0 | 0 |
| 2025-10-11 | Israel | 🏠 | 5:0 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2025-09-09 | Moldova | 🏠 | 11:1 | World Cup Qualifiers (Europe) | 73 | 0 | 0 | 0 |
| 2025-09-04 | Finland | 🏠 | 1:0 | International Friendlies | 90 | 0 | 0 | 0 |
| 2025-06-09 | Norway | ✈ | 0:1 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2025-06-06 | Italy | 🏠 | 3:0 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2025-03-25 | Norway | ✈ | 2:4 | World Cup Qualifiers (Europe) | 90 | 1 | 0 | 0 |
| 2025-03-22 | Norway | ✈ | 0:5 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 1 |
| 2024-11-17 | Kazakhstan | 🏠 | 5:0 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2024-11-14 | Norway | ✈ | 1:4 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2024-10-13 | Norway | ✈ | 5:1 | UEFA Nations League B | 90 | 0 | 0 | 0 |
| 2024-10-10 | Slovenia | 🏠 | 3:0 | UEFA Nations League B | 90 | 0 | 0 | 0 |
| 2024-09-09 | Austria | 🏠 | 2:1 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2024-09-06 | Norway | ✈ | 0:0 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2024-06-08 | Norway | ✈ | 3:1 | International Friendlies | 90 | 0 | 0 | 0 |
| 2024-06-05 | Kosovo | 🏠 | 3:0 | International Friendlies | 90 | 0 | 0 | 1 |
| 2024-03-26 | Slovakia | 🏠 | 1:1 | International Friendlies | 90 | 0 | 0 | 0 |
| 2024-03-22 | Czechia | 🏠 | 1:2 | International Friendlies | 90 | 0 | 0 | 0 |
| 2023-11-19 | Norway | ✈ | 3:3 | European Qualifiers | 90 | 0 | 0 | 1 |
| 2023-11-16 | Faroe Islands | 🏠 | 2:0 | International Friendlies | 90 | 0 | 0 | 0 |
| 2023-10-15 | Spain | 🏠 | 0:1 | European Qualifiers | 13 | 0 | 0 | 0 |
| 2023-10-12 | Norway | ✈ | 0:4 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2023-09-12 | Georgia | 🏠 | 2:1 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2023-09-07 | Jordan | 🏠 | 6:0 | International Friendlies | 90 | 1 | 0 | 0 |
| 2023-06-20 | Cyprus | 🏠 | 3:1 | European Qualifiers | - | 0 | 0 | 0 |
| 2023-06-17 | Scotland | 🏠 | 1:2 | European Qualifiers | - | 0 | 0 | 0 |
| 2023-03-28 | Norway | ✈ | 1:1 | European Qualifiers | - | 0 | 0 | 0 |
| 2023-03-25 | Norway | ✈ | 3:0 | European Qualifiers | - | 0 | 0 | 0 |
| 2022-11-20 | Finland | 🏠 | 1:1 | International Friendlies | - | 0 | 0 | 0 |
| 2022-11-17 | Norway | ✈ | 1:2 | International Friendlies | - | 0 | 0 | 0 |
| 2022-09-27 | Serbia | 🏠 | 0:2 | UEFA Nations League B | 32 | 0 | 0 | 0 |
| 2022-09-24 | Norway | ✈ | 2:1 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2022-06-12 | Sweden | 🏠 | 3:2 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2022-06-09 | Slovenia | 🏠 | 0:0 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2022-06-05 | Norway | ✈ | 1:2 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2022-06-02 | Norway | ✈ | 0:1 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2022-03-29 | Armenia | 🏠 | 9:0 | International Friendlies | 90 | 0 | 0 | 0 |
| 2022-03-25 | Slovakia | 🏠 | 2:0 | International Friendlies | - | 0 | 0 | 0 |
| 2021-11-16 | Norway | ✈ | 2:0 | World Cup Qualifiers (Europe) | - | 0 | 0 | 0 |
| 2021-11-13 | Latvia | 🏠 | 0:0 | World Cup Qualifiers (Europe) | - | 0 | 0 | 0 |
| 2021-10-11 | Montenegro | 🏠 | 2:0 | World Cup Qualifiers (Europe) | - | 0 | 0 | 0 |
| 2021-10-08 | Norway | ✈ | 1:1 | World Cup Qualifiers (Europe) | - | 0 | 0 | 0 |
| 2021-09-07 | Gibraltar | 🏠 | 5:1 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2021-09-04 | Norway | ✈ | 0:2 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2021-09-01 | Netherlands | 🏠 | 1:1 | World Cup Qualifiers (Europe) | - | 0 | 0 | 0 |
| 2021-06-06 | Norway | ✈ | 2:1 | International Friendlies | 88 | 0 | 0 | 0 |
| 2021-06-02 | Norway | ✈ | 0:1 | International Friendlies | 72 | 0 | 0 | 0 |
| 2021-03-30 | Norway | ✈ | 0:1 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2021-03-27 | Norway | ✈ | 3:0 | World Cup Qualifiers (Europe) | 90 | 0 | 0 | 0 |
| 2021-03-24 | Norway | ✈ | 0:3 | World Cup Qualifiers (Europe) | - | 0 | 0 | 0 |
| 2020-11-18 | Norway | ✈ | 1:1 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2020-11-15 | Norway | ✈ | 3:0 | UEFA Nations League B | - | 0 | 0 | 0 |
| 2020-10-14 | Northern Ireland | 🏠 | 1:0 | UEFA Nations League B | 90 | 0 | 0 | 0 |
| 2020-10-11 | Romania | 🏠 | 4:0 | UEFA Nations League B | 90 | 0 | 0 | 0 |
| 2020-10-08 | Serbia | 🏠 | 1:2 | European Qualifiers Play-offs | 120 | 0 | 0 | 0 |
| 2020-09-07 | Norway | ✈ | 1:5 | UEFA Nations League B | 90 | 0 | 0 | 0 |
| 2020-09-04 | Austria | 🏠 | 1:2 | UEFA Nations League B | 90 | 0 | 0 | 0 |
| 2019-11-18 | Norway | ✈ | 1:2 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2019-11-15 | Faroe Islands | 🏠 | 4:0 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2019-10-15 | Norway | ✈ | 1:1 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2019-10-12 | Spain | 🏠 | 1:1 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2019-09-08 | Norway | ✈ | 1:1 | European Qualifiers | - | 0 | 0 | 0 |
| 2019-09-05 | Malta | 🏠 | 2:0 | European Qualifiers | - | 0 | 0 | 0 |
| 2019-06-10 | Norway | ✈ | 0:2 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2019-06-07 | Romania | 🏠 | 2:2 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2019-03-26 | Sweden | 🏠 | 3:3 | European Qualifiers | 90 | 0 | 0 | 0 |
| 2019-03-23 | Norway | ✈ | 2:1 | European Qualifiers | 90 | 0 | 0 | 1 |
| 2018-11-19 | Norway | ✈ | 0:2 | UEFA Nations League C | - | 0 | 0 | 0 |
| 2018-11-16 | Norway | ✈ | 1:1 | UEFA Nations League C | - | 0 | 0 | 0 |
| 2018-10-16 | Bulgaria | 🏠 | 1:0 | UEFA Nations League C | - | 0 | 0 | 0 |
| 2018-10-13 | Slovenia | 🏠 | 1:0 | UEFA Nations League C | - | 0 | 0 | 0 |
| 2018-09-09 | Norway | ✈ | 1:0 | UEFA Nations League C | 90 | 0 | 0 | 0 |
| 2018-09-06 | Cyprus | 🏠 | 2:0 | UEFA Nations League C | 90 | 0 | 0 | 0 |
| 2018-06-06 | Panama | 🏠 | 1:0 | International Friendlies | 90 | 0 | 0 | 1 |
| 2018-06-02 | Norway | ✈ | 2:3 | International Friendlies | 90 | 0 | 0 | 0 |
| 2018-03-26 | Norway | ✈ | 0:1 | International Friendlies | 90 | 0 | 0 | 0 |
| 2018-03-23 | Australia | 🏠 | 4:1 | International Friendlies | 90 | 0 | 0 | 0 |