Bjarni Mark Antonsson Duffield (born 27 December 1995) is an Icelandic footballer who plays as a midfielder for Valur. The son of Mark Duffield, a footballer in the lower leagues of Iceland, Bjarni started his career at KA and at a young age moved to Norway to pay football. After spending close to a decade in Norway he moved to Icelandic giants Valur to plug a hole in the club's midfield.
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