Gustav Marcussen

Lyngby

Marcussen played youth football in Hørsholm-Usserød, B 1903 and Frem before joining the academy of Lyngby. He was promoted to the first team in 2016, where he signed his first professional deal with the club. On 31 August 2016, Marcussen made his official debut for Lyngby, starting in a 3–1 win in the Danish Cup over Frederiksværk FK in the second round. Marcussen made his Danish Superliga-debut for Lyngby on 18 May 2017 in a match against Brøndby IF. He came off the bench in the 87th minute, replacing David Boysen as the match ended in a 0–2 away win for Lyngby. Three days later, he made his second appearance for the club, once again replacing Boysen as Lyngby beat F.C. Copenhagen in a 3–1 home win. Those two appearances were his only during the 2016–2017 season. Marcussen made his first professional goal the following season, scoring an 86th-minute equaliser which secured a 1–1 home draw against SønderjyskE on 12 August 2017. He ended the season with 15 league appearances and the one goal, as Lyngby suffered relegation to the second division. The departure of first-team profiles such as Mikkel Rygaard and talents such as Bror Blume, due to relegation and Lyngby's poor financial situation, meant that Marcussen saw more playing time during the 2018–19 season. He had an eventful season, making 28 total appearances in which he scored two goals. The campaign culminated with a third place in the league table and promotion play-offs, which Lyngby won 4–3 over two…

Marcussen represented Denmark at every age group from under-18 to under-21 level. On 22 March 2018, he made his first appearance for the Denmark under-21 team in a 5–0 friendly win over Austria in Wiener Neustadt.

As of match played 7 October 2025