[8] He had scored 20 goals for Espanyol youth teams the previous season,[9] and Real was reported to have made the youngster's signing a top priority, also including Andri's younger brother Dani in the deal.

[4] His first season in Madrid was successful, as his performances earned him a place in the U19 squad at only 16 years old, where he scored several goals, under Raúl's management.

[12] In July 2021, Andri was promoted to the Castilla side, and in September 2021, he was included in Real Madrid's Champions League squad for the first time.

[13][14] In the summer of 2022, Andri found himself out of favour in the Castilla side, leading him to leave and sign for IFK Norrköping.

[citation needed] On 18 August 2023, Guðjohnsen joined Danish Superliga side Lyngby on a one-year loan deal with a purchase option.