[1] Hammershøy-Mistrati progressed through FC Midtjylland's academy after joining from KB in 2007,[2] but did not make his breakthrough into the first team.
[7] His contract was extended in July of the same year, where he signed a one-year extension keeping him at Helsingør until 2017.
He made his debut at the top level on 16 July 2017, starting against his former side Helsingør on the first matchday of the 2017–18 season, as Hobro won 2–1.
[9] On 10 December, he stood out in the league match against FC Nordsjælland, providing two assists for Quincy Antipas in a 3–2 loss.
[13] He won his first trophy at the end of the 2020–21 season, as Randers beat SønderjyskE by 4–0 in the Danish Cup final.