Hakon Rafn Valdimarsson was born on 13 October 2001 in Iceland. His route into goalkeeping was unusual: he initially played outfield and was also involved in handball before moving into goal during his teenage years. After time around KR and Grotta's academy system, he committed fully to the position and began climbing quickly, first in Iceland's lower divisions and then with Grotta as the club rose through the pyramid.
At Grotta, Valdimarsson experienced both promotion and top-flight exposure in Iceland. His performances earned a move to IF Elfsborg in Sweden in 2021. The first season was not instantly dominant, but once he became a regular he developed into one of the Allsvenskan's outstanding goalkeepers. In 2023 he was named the league's Goalkeeper of the Year, keeping a high number of clean sheets and helping Elfsborg finish level on points with Malmo at the top of the table.
Brentford signed Valdimarsson in January 2024 as a young goalkeeper with a clear development ceiling. He initially worked behind established senior options, then made his Premier League debut against Brighton and Hove Albion in December 2024 after replacing the injured Mark Flekken and keeping a clean sheet in a goalless draw. In April 2026, Brentford rewarded his progress with a new long-term contract running to 2030, with a club option beyond that.
For Iceland, Valdimarsson made his senior international debut against Portugal in November 2023. He arrived in the national team at a time when Iceland were refreshing parts of the squad after the peak generation of the late 2010s. His international record is still developing, but his size, league experience in Sweden and Premier League environment make him a natural long-term contender for the national number-one role.
Valdimarsson is a right-footed goalkeeper, around 1.95 m, whose strengths are reach, box command and comfort dealing with crosses. Brentford's goalkeeper coaches have described him as agile and reactive despite his size, and his handball background may help explain his coordination and confidence with high balls. In style he invites comparison with a younger Frederik Ronnow: a Nordic goalkeeper with strong fundamentals, good frame coverage and enough distribution to fit a possession-aware team.