[citation needed] In 2010, Agdestein was transferred to English club Brighton & Hove Albion for an undisclosed fee and featured in the development squad.
[2] Three days later, he made his first league appearance for Brighton coming on as a second-half substitute and providing an assist to Will Buckley in a 2–1 victory at Peterborough United.
[6] Following his return from Bath City, Agdestein soon played regularly in the reserve team and in March 2012, signed a two-year contract.
After breaking into the first team squad he earned the title as the club's top goalscorer in his final Haugesund season after bagging 10 league goals.
[19] In a surprise move, Agdestein chose to come back from retirement in august 2024 in an attempt to help struggling Stord avoid relegation.