FC Copenhagen In September 2014, after some impressive performances while captaining the reserves, Hendriksson signed professional terms with
FC Copenhagen and was given squad number 36. Hendriksson was included in the matchday squad for the first time for the
Danish Superliga home match against
FC Midtjylland on 15 August 2014, although he remained on the bench. On 30 October 2014 he made his first team debut for F.C. Copenhagen in the cup match against
FC Roskilde. On 13 April 2015, Olsen made his first appearance for
F.C. Copenhagen in the
Danish Superliga, coming in as a substitute in an away win against
Silkeborg. On 14 May 2015, Hendriksson scored the winning goal for
F.C. Copenhagen in a 3–2 extra-time win against
FC Vestsjælland in the
2014–15 Danish Cup Final, after coming off the bench in the 84th minute. Two weeks later Hendriksson scored the winning goal again from a freekick in a 1–0 win against
Odense Boldklub, which secured
F.C. Copenhagen a second-placed finish in the Danish league.
Randers FC In July 2016, Hendriksson signed a three-year deal with
Danish Superliga club
Randers FC. Making him the third Faroese player to sign for a Danish top division team in 2016, after his former
Vendsyssel FF teammate
Hallur Hansson was signed by
AC Horsens and
Jóan Símun Edmundsson was signed by
Odense Boldklub FH On 21 April 2018, Hendriksson immediately joined Icelandic club
FH.
Helsingborgs Hendriksson joined Swedish club
Helsingborgs IF on 28 December 2019. With this, he became the first Faroese player to play in the
Allsvenskan, and would be joined by national teammate
Viljormur Davidsen in 2022.
Fredrikstad On 17 January 2023 Hendriksson signed for
Fredrikstad FK, managed by compatriot
Mikkjal Thomassen. He was a part of their
Norwegian Cup-winning team in their
2024 season, scoring a penalty in the final's penalty shootout, and played a crucial role in their promotion to the
Eliteserien in 2023.
NSI On 4 January 2025 Hendriksson left Fredrikstad for
NSÍ Runavík. This is the first time Hendriksson will play in the Faroe Islands, having left boyhood club
B71 Sandoy for
F.C. Copenhagen in 2011 before making his competitive debut. ==International career==