Tim Broomhead and Matthew Scharenberg have both been informed that they won’t be offered new contracts, ending their time at the club.
Dunn switched from the Demons to the Magpies at the end of 2016 and played 33 of his 198 AFL games in the black and white.
Scharenberg played 41 games over seven seasons in a career largely cruelled by injuries after getting drafted with Pick 6 in the 2013 AFL Draft.
The defender is reportedly keen to continue his career at another AFL club and is exploring a move back to South Australia.
Broomhead played 37 games across eight seasons with the Pies, and like Scharenberg, is hopeful of playing on at another club.
Collingwood GM of Football Geoff Walsh thanked all three players for their contributions to the club.
“We say thanks to each of them and wish them well for the future,” Walsh told the club website.
“They have been a part of our story and I trust we will always be a proud part of theirs.”
They join Ben Reid and Travis Varcoe in departing the club, who announced their retirements in recent weeks.
Collingwood has bid farewell to midfielder Tim Broomhead and defender Matthew Scharenberg, who will not be offered contracts for 2021.
Thanks and all the best for the next chapter, boys!
— Collingwood FC (@CollingwoodFC) October 14, 2020