[3] Lorentzen transferred to Brann ahead of the 2012 season, and was allowed to play senior football for the club's third team in the 4. divisjon despite his young age.
[4] He became the youngest-ever Brann-player, aged 15 years and 280 days when he replaced Erik Huseklepp in the match against IK Start.
Neither of the two are however the youngest-ever player in Tippeligaen, as Zymer Bytyqi made his debut for Sandnes Ulf at the age of 15 years and 261 days in the 2013 season.
[10] On 10 August 2022, Lorentzen signed a two-year contract with second-tier Eerste Divisie Dutch club Helmond Sport.
[12] Lorentzen returned to Norway to sign a one-and-a-half-year contract with Norwegian First Division club Start on 8 July 2024.