[2] On 15 July 2014, Halse signed a two-year contract with Brøndby IF, initially joining the club's under-19 team.
[3] He made his professional debut in the Danish Superliga under head coach Auri Skarbalius on 13 March 2015, replacing Christian Nørgaard in the 83rd minute of a 1–0 home win over Randers FC.
[5] Halse joined Danish 1st Division club FC Roskilde on 22 July 2016, signing a short-term contract.
[6] After impressing and growing into a starter for the club, Halse signed a two-year extension on 26 October keeping him at Roskilde until 2018.
[7] He played four seasons with Roskilde in the Danish second tier, making 122 total appearances in which he managed to score five goals.