As a youngster he was on the roster of English giants Arsenal, but limited playing time saw him returning to KR Reykjavík on a loan deal.

[4] The timing of that release effectively leaves Stefán in limbo because other clubs are unable to sign him until the summer of 2011 due to the transfer window rules.

[4] On 16 March 2011, Stefán was presented as the main event at the seasonal kick-off of Lillestrøm SK, signing a contract expiring on 1 August.

However, after enduring a terrible run of five goalless losses, Lillestrøm decided to bring him back 29 September for the remainder of the 2011 season.

[7] In 2017, Stefán was appointed the manager of Haukar Gíslason made his debut for Iceland in a January 2002 friendly match against Kuwait as a substitute for Helgi Sigurðsson.