[7] He made his debut for the Hamburg based club on 31 August coming on as a substitute in a 3–3 draw against Dynamo Dresden.
[8] He made his first start for St. Pauli which was against fierce rivals Hamburger SV where Kiezkicker won 2–0, claiming a first home win in 59 years against their local side.
[12] Østigård scored his first goal in English football on 5 April opening the scoreline in an eventual 3–1 home victory over Bristol City.
[20] He made his debut four days later, playing the whole match of the 1–0 home loss against Spezia in the league, in what was his 100th club career appearance.
[30] After being capped at all youth levels he made his senior debut for the Norwegian national team playing the whole match helping keep a clean sheet in a 2–0 friendly win at home over Slovakia on 25 March 2022.
[31] He scored his first senior international goal on his eighth appearance on 17 November, heading home from a Martin Ødegaard corner in the 2–1 friendly win away at the Republic of Ireland.
[32] Napoli His older sister Rikke was a very talented handball player at top level, but had to suspend her career at the age of 23 due to her many knee injuries.