Liga club Eintracht Braunschweig in order to get some playing time,[8] and was reunited with his former manager at HB Køge.

Liga table, the manager was fired[11] and, as a result, Amundsen played sporadically over the following three months following the regime change, appearing in 14 total matches across all competitions for the German club.

[15] On 10 February 2021, it was announced that Vejle and New York City FC of Major League Soccer had successfully negotiated a transfer of Amundsen for a reported fee of around ten million Danish Krone.

[22] On 25 April 2023, Amundsen was traded to the Columbus Crew in exchange for a potential figure of up to $500,000 In General Allocation Money.

[23][24] He made his first appearance for the Crew on 10 May 2023, starting in a Lamar Hunt U.S. Open Cup win against Loudoun United.