AZ In January 2015, Chatzidiakos, who moved from
Panathinaikos to
AZ as a youth in 2011, signed a three-year professional contract with the Dutch team. He made his debut with the club in both the
Champions League and the
Europa League matches. In the past, he was crowned Dutch champion with the
AZ U16. In 2017 he helped
Jong AZ win the title in
Tweede Divisie and achieve promotion to
Eerste Divisie. He made his debut in the club, along with his first appearance in
Eredivisie in a 2–1 away loss against
PEC Zwolle as a substitute in the second half. On 3 December 2017, the 20-year-old Greek international central defender, scored his first goal in the
Eredivisie, in a 2–0 away win against
VVV-Venlo. He sealed the win in the 84th minute "With an excellent shot at the height of the area, and this is not the first goal of his career, as he scored in the
KNVB Cup against
MVV Maastricht in September." With this victory, Alkmaar reached 6 consecutive wins in the League. He started the
2018–19 season as the undisputed leader of the AZ's defence. On 12 August 2018, he scored his first goal for the season, with a right footed shot from very close range to the top left corner, after
Oussama Idrissi's assist in a 5–0 home win game against
NAC Breda. On 2 November 2019, he scored his first goal for the
2019–20 season with a right footed after an assist from
Owen Wijndal in a triumphic 3–0 home win game against
FC Twente. On 7 November 2019, he lashed a thunderous effort high into the left corner, scoring his first goal in the
UEFA Europa League in a hammering 5–0 away win against
FC Astana. On 28 November 2019, Chatzidiakos suffered the dreaded anterior cruciate ligament injury while on
UEFA Europa League game for AZ Alkmaar, medical tests have confirmed. Chatzidiakos was included in the AZ starting line-up to face
Partizan Belgrade at home in the Europa League, but he was forced off in the 53rd minute with a knee injury. Subsequent medical tests this morning confirmed that the talented 22-year-old defender suffered the anterior cruciate ligament injury and will return to action after a period of at least six months. On 7 February 2020, Alkmaar announced the extension of the contract with the Greek international until the summer of 2024.
Cagliari On 1 September 2023, Chatzidiakos signed a four-year contract with
Cagliari in Italy. Cagliari officially purchased the defender for €2m, effectively activating his release clause. On 2 September 2024, he moved on a season-long loan to
Copenhagen in Denmark. ==International career==