Risdon has represented Australia on nine occasions, debuting in 2015.
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 2011–12 season Risdon established himself as a regular starting 24 matches at 19 years of age.
Injury plagued his 2013–14 season before he returned to the starting side for 25 appearances in the 2014–15 season. He also scored his second career goal on 28 March 2015 with an 88th minute winner over Western Sydney Wanderers (3–2).