*Club domestic league appearances and goals, correct as of 17:17, 2 November 2024 (UTC) ‡ National team caps and goals, correct as of 23:11, 14 October 2024 (UTC)
Kadıoğlu spent his early years with NEC. On 28 August 2016, he made his professional debut as a late substitute against AZ Alkmaar in a 2–0 away loss. In his first professional year, he scored 4 goals and made 4 assists in 27 (9 starts) Eredivisie matches. NEC finished the season in 16th position and were relegated to the Eerste Divisie after the relegation play-off. Kadıoğlu also played 3 relegation play-off matches.
2017–2018 season
In his second professional year with the team, Kadıoğlu remained a key part of the squad. He scored 7 goals and made 12 assists in 34 (31 starts) Eerste Divisie matches. NEC finished the season in 3rd place but weren't promoted to Eredivisie after losing against Emmen in the promotion play-offs. Kadıoğlu also played 3 promotion second round playoff matches.
Fenerbahçe
2018–2020: Signing and emergence
In July 2018, Kadıoğlu signed for Turkish Süper Lig club Fenerbahçe.[3] He made his debut for the senior squad on 20 December 2018, coming on as a substitute in a Turkish Cup match against Giresunspor.[4] In his first season, he played mostly for the under-21 team, making 11 appearances with them in the U21 Ligi.
The following season he started to find more time in the senior squad and scored his first goal for Fenerbahçe on 19 August 2019 against Gaziantep, netting the final goal in a 5–0 victory.[5]
2020–2022: Increased playing time
In his third season, under new manager Erol Bulut, he started to find more time in first team and became one of the key players who took more responsibility on the field.
In the subsequent year, with changes in management, first under Vitor Pereira and then İsmail Kartal, he solidified his starter role. Despite his age, he consistently earned and played full 90-minute matches.
On 17 March 2022, Fenerbahçe announced that they had signed a four-year contract with Kadıoğlu until June 2026.[6]
2022–2024: Key player
In his fifth season, he emerged as a versatile player for Fenerbahçe, occupying multiple positions in the first eleven, mainly at both full-back positions. He finished the season with 4 goals and 5 assists across all competitions, amassing a total of 4,175 minutes of playtime.
In his sixth season, he made a very strong start with new coach and club legend İsmail Kartal.
Brighton & Hove Albion
On 27 August 2024, Kadıoğlu joined Premier League club Brighton & Hove Albion for a reported fee of £25m, with an additional £4.2m in add-ons. He signed a four-year contract.[7]
On 18 September 2024, Kadıoğlu scored his first goal for Brighton in a 3–2 victory over Wolverhampton Wanderers in the third round of the EFL Cup.[8] On 2 November, he scored his first Premier League goal in a 2–1 defeat to Liverpool.[9]
International career
Kadıoğlu was born in the Netherlands to a Turkish father and a Dutch Canadian mother.[10] He was therefore eligible to represent Turkey, the Netherlands and Canada internationally.[11] He was a youth international for the Netherlands.[12]
In March 2021, Kadıoğlu was named to the Netherlands U-21 squad for that year's UEFA European Under-21 Championship.[13] Later that year on 12 November 2021, Turkey coach Stefan Kuntz revealed that he was expecting Kadıoğlu to make his decision on his international future in March 2022.[14]
On 3 January 2022, his club Fenerbahçe announced that he had chosen to represent the Turkey national team.[15][16]
On 4 June 2022, Kadıoğlu debuted with Turkey in a 4–0 UEFA Nations League win over the Faroe Islands.[17] On 18 November 2023, he scored his first international goal in a 3–2 friendly win over Germany in Berlin.[18]