[2] Berggreen had an excellent second half season, where he in total played 21 games and scored 12 goals.
[4] He made his debut in the Danish first-tier for Hobro IK during the first half of the 2014–15 Superliga season.
[7] On 23 February 2015, made his debut in the starting line-up, in a 1–1 draw on the 22nd matchday against RB Leipzig, also scoring his first goal for Eintracht Braunschweig.
Weeks after his return, he suffered an anterior cruciate ligament injury and was out the rest of the season.
On 17 July 2019, Berggreen joined FC Twente on a one-year contract with an option for one further year.
[13] His contract was terminated by mutual consent on 1 January 2022, effectively making him a free agent again.