*Club domestic league appearances and goals, correct as of 10:18, 10 November 2024 (UTC) ‡ National team caps and goals, correct as of 22:21, 19 November 2024 (UTC)
Alfons started his career with local club Breiðablik in Kópavogur in 2015, playing a single cup game, before going on loan to Þór from Akureyri for the latter half of the season.[2] In 2016, he played most of Breiðablik's games as they finished 6th in the 2016 Úrvalsdeild.[2]
In January 2017, he was transferred to Swedish club IFK Norrköping.[3] He spent three seasons there without ever cementing his place, spending time on loan at IF Sylvia and Landskrona BoIS in Sweden and Breiðablik in Iceland.[4]
In February 2020, he joined Norwegian club Bodø/Glimt and was a key player in the 2020 season as the club won their first national title.[5][6] There, he replaced former right back player Erlend Reitan who was on loan from Rosenborg.
On 27 December 2022, he joined Dutch club FC Twente.[7]
He joined English League One (third-tier) club Birmingham City on 12 August 2024 on loan for the season. The deal included an option to purchase.[8] He made "a solid, no nonsense debut" the next day as a second-half substitute in Birmingham's 1–0 EFL Cup win away to Charlton Athletic.[9]
International career
Alfons is as of 15 November 2020 the highest capped player of the Icelandic U21 national team with 30 games.[2][10]
^"Leikmaður: Alfons Sampsted" [Player: Alfons Sampsted] (in Icelandic). Knattspyrnusamband Íslands (Iceland Football Association). Retrieved 19 November 2024.