"To get to England has always been my goal," Arnason told the club's official website. "And that's what I told my agent my objective was."
Arnason, who joins on a free transfer following his release from Danish side Aarhus, is hoping to shed his tag as a defensive-minded player and impress as a box-to-box midfielder.
"It is not like I am stuck as a sitting midfielder. I would like to get into the box and head a few goals in."