Norwich City reportedly beat off competition from a number of top European sides including Stuttgart, Cologne and Ajax to sign Icelandic Under-17 intenrational Agust Hlynsson from Breidablik on 5th January 2017 for an undisclosed fee. his contract could extend to 2020

An attacking midfielder, Hlynsson broke through for his Breidablik senior debut in a cup tie against Kria in May, setting a new record as the youngest goalscorer in the team's history in a 3-0 win. 

He made eight further appearances, two of which came in the Europa League last summer when he became the fourth youngest player to feature in the competition. 

The teenager received his first call-up to Iceland's Under-17s aged just 15 in September 2015, and since then has earned 15 caps in that age group, netting three times. 

Academy Head of Recruitment Gregg Broughton added: "We've been tracking Agust for three years so it's been a long process, as it is when you try and bring in any player from abroad. He spent some time with us last season, he enjoyed that experience and from there we agreed a fee with Breidablik in the summer and in this transfer window we have finalised the deal. The plan is for him to be playing Under-23s football straight away. He's already had an opportunity to train with the first team and Alex Neil likes him as a player. He has great attacking qualities but he also has an unbelievable attitude and work ethic. Those two things will serve him really well and we can't wait to see him pull on a Norwich City shirt"

Agust made his frist Norwich appearance in the 4-0 FA Youth Cup win at Burnley on 6th January 2017.

In August 2017, he was selected for the Iceland Under-19 team.

On 31st August 2017, he was sold to Danish side Brondby for an undisclosed fee, subject to international clearance. 

on 23rd April 2019 he returned to Iceland to sign for Vikingur. On june 7th 2019 he made his debut for Iceland's under-21 side.

On 5th October 2020 he signed for Danish side AC Horsens. In 2021 he was loaned to Icelandic side FH and then joined their rivals Valur on loan in 2022.