Career
Risdon made his senior debut for Perth Glory on 28 November 2010, starting against the North Queensland Fury. During his debut season he made six appearances in total, including three straight starts between rounds 24 and 26. In the 2011-2012 season Risdon established himself as a regular starting 24 matches at 19 years of age.
He scored his first career goal in round 26 of the 2012-2013 A-League season with the winning goal in the 94th minute against Melbourne Victory (3–2).
Injury plagued his 2013-2014 season before he returned to the starting side for 25 appearances in the 2014-2015 season. On 7 March 2011 he was selected to represent the Australia Olympic football team in an Asian Olympic Qualifier match against Iraq.
Risdon made his senior debut for the Socceroos in a 2018 World Cup qualifying match against Bangladesh on 7 November 2015. On 20 July 2013, Risdon played for the against Manchester United in a friendly match.