He has played for Djurgården, AGF Aarhus, Esbjerg fB, Plymouth Argyle, Aberdeen (two spells), Rotherham United, Malmö FF, Omonia and Gençlerbirliği.

[5] Capable of playing in midfield or defence, Kári has represented Iceland at senior level since 2005, making 90 appearances and scoring 6 goals in the process.

He brought a different style of football to Spokane, the likes of which Bulldog legends Steve Owens and Trevor Conrad had never seen.

[7] During a candid interview with Gonzaga Bulletin reporter Ryan McAteer he did admit "Americans though, are in much better shape and can run forever.

Kári had a trial at English Football League Championship side Plymouth Argyle in the summer of 2009, and after impressing in a couple of friendly matches he signed a one-year contract with the club.

He made his debut in August 2009 against Derby County and established himself as a first-team regular at the heart of the club's defence.

[15] He made his debut in a 0–0 draw against St Johnstone on 23 July and scored his first goal for Aberdeen on 15 October, the opener in a 3–1 win against Dundee United.

[19] Kári rejected Aberdeen's offer of a new contract towards the end of January and manager Craig Brown said that he expected him to leave in the summer.

[29] Kári Árnason was called up to the senior Iceland squad in March 2005 for the game against Croatia and he made his debut four days later against Italy.