[1] He made his Serie B debut for Spezia on 29 September 2018 in a game against Carpi as a 59th-minute substitute for Andrey Galabinov.
[3] On 13 September 2020, he was loaned out again, this time to Danish Superliga club Odense Boldklub for the 2020–21 season.
Instead of playing in the closing game on 31 March, he was called up to the senior squad and made his debut for it on the same day in a World Cup qualifier against Liechtenstein.
[9] Sveinn Aron's father Eiður Guðjohnsen is the joint record goalscorer for the Iceland national football team and played for many notable clubs, such as Bolton Wanderers, Chelsea, Barcelona and Tottenham Hotspur.
His younger brothers Andri and Daniel were on the youth teams of Real Madrid.