the last day of play in the regular season. Addressing Larsen's debut, Kent Nielsen, AaB's head coach, stated that "we [AaB] are therefore full of confidence and feel safe starting him, just as we are sure that he can also tackle the adversity that will come, sooner or later." Carsten Christensen was brought in as a backup for Larsen in the summer of 2011, leading up to his debut season. In his debut season, Larsen made 32 appearances out of 33 possible in the Superliga. He received two warnings during the season. At the age of 20, Larsen signed a four-year contract extension with AaB keeping him a part of the club from Aalborg until 2015. He signed the contract at a point, where he had made 17 official first-team appearances for AaB. 2012–2014 The following season also saw him as the starting goalkeeper for AaB. He played all 33 matches from start, and also played a full 90 minutes in them all. At the end of the season, Larsen had played 2970 minutes in total in the 2012–13 season, as AaB finished in 5th place. In the 2013–14 Danish Superliga season, his third season as the club's starting goalkeeper, he made 32 out of 33 possible appearances in the league, playing full time in all 32 matches. In these 32 matches, Larsen also incurred one single warning in a match against Randers FC on 11 November 2013, which resulted in him receiving three suspension points. In December 2013, he was voted second in Danish Goalkeeper of the Year awards by his fellow Superliga and 1st Division (second-tier) goalkeepers for 2013. Larsen signed a four-year contract extension on 2 May 2014, keeping him at the club until 30 June 2018. AaB would go on to win their fourth Danish championship in the 2013–14 season. The title was secured on 11 May 2014, where AaB drew 0–0 away against FC Vestsjælland, as FC Midtjylland lost 3–2 to Copenhagen, which effectively made the club from Aalborg Danish champions. AaB also won the Danish Cup this year, defeating Copenhagen in the final on 15 May 2014 to secure the Danish Double. To kick off the new season, Larsen appeared in two UEFA Europa League qualifiers on 18 and 26 July 2014 against Georgian club Dila Gori, where AaB lost 3–0 on aggregate. On 26 December 2014, it was announced that Larsen had won