The following summer, with Belconnen outed from the competition, Casey moved to Wollongong Wolves for a brief spell before being signed to New Zealand Knights in April 2006.

[2][3] He played in four matches in Sydney's AFC Champions League 2007 campaign and also made his mark on the scoresheet in a friendly against Marconi Stallions.

[6] With the demise, and eventual folding of North Queensland Fury due to financial reasons, Casey ended up signing for Illawarra Premier League club Dandaloo FC, joining former A-League players Alvin Ceccoli and Noel Spencer.

Adam signed with the Rockdale City Suns for the 2013 NSWPL season, joining his former Sydney FC coach Branco Culina at the club.

While at the AIS, he was establishing a place in the Australian U17 squad, scoring six goals in the Joey's 2003 FIFA U-17 World Championship qualification campaign.