Patrick Karnezis retires, citing a
desire to pursue interests outside football.
Karnezis, 23, played 21 games for the Brisbane Lions before asking for a trade to Collingwood at the end of 2013.
The No.25 pick in the 2010 AFL draft managed just four games for the Magpies, the club he supported as a child, in two seasons.
He made his Collingwood debut in round three this season and added three more games before being dropped after the club's loss to Richmond in round seven.
Injuries plagued Karnezis in his first year on the Magpies' list and he failed to play a game in 2014.
"After five years in the AFL system, it is the right time for me to step away and pursue other interests in my life such as my studies, overseas travel and opportunities in our family businesses," Karnezis said.
"I want to thank Collingwood and Brisbane for the opportunity to play at the elite level, the experiences I've had at both clubs has helped shape the person I am today."