Career
After moving from Canberra to Perth as a child, Armfield spent all his junior years playing rugby union, where, among his duties, he was his team"s designated place-kicker. After converting to Australian Rules Football at the age of 17, where he played for the local Kalamunda Football Club, before being recruited that year by Swan Districts Football Club in Western Australia in 2002, playing as a utility/midfielder. He played all twenty games for the Swans" seniors in 2007.
Armfield nominated for the 2007 American Federation of Labor-Congress National Draft.
He was noted for his fast pace and quick acceleration, and a strong tackling style remnant from his rugby union background. He was selected by the Carlton Football Club with a third round selection (Number 46 overall), at the age of almost twenty-one years, rather old for a National Draft selection.
Armfield made his debut in Round 10, 2008 against Geelong. Armfield was a semi-regular player in his first four seasons with the club, playing 60 of a possible 92 games throughout that time, as either a midfielder/small forward, or in defensive roles against small forwards.