Lions’ football manager Danny Daly said McStay went with the club’s blessing as he had not missed a beat despite ongoing speculation about his future this year.
“Dan has been a great teammate in his time with the Lions and remained committed to our cause until the end,” Daly said.
“He stuck with the club during many lean seasons and played a vital role in helping the Brisbane Lions play finals football the past four seasons.”
McStay will add depth to the Magpies forward and defensive groups. Battered Collingwood forward Brody Mihocek battled through the back half of the season,while Collingwood lacked an extra tall defender in their preliminary final loss to Sydney.
The Magpies are working to re-signrestricted free agent Jordan De Goey and forward Oliver Henry and are also in the market for Adelaide’s Billy Frampton and the Giants’ Bobby Hill.