Six senior Magpies are among a group of over 50 players listed as potential free agents at the end of the 2016 season.

Nathan Brown and Steele Sidebottom are restricted free agents, meaning Collingwood will have the opportunity to match any offers made by opposition clubs at the end of the season.

Dane Swan, Jarryd Blair, Brent Macaffer and Alan Toovey are also on the list released by AFL Media as unrestricted free agents.

Collingwood still has the opportunity to re-sign the players and remove them from the free agent pool prior to the end of the season.

After seven seasons and 143 Collingwood games, Sidebottom, 25, is arguably one of the biggest names in the free agent pond.

As recently as February the midfielder expressed his desire to remain a Magpie beyond his current contract.

"I'm fairly confident (the contract) will sort itself out in the next couple of weeks and I'll get it out of the way before the season starts and just worry about footy," Sidebottom told AFL Media on February 4.

"I can concentrate on my footy the whole year and don't have to worry about contracts and that kind of thing so I'm pretty confident it will sort itself out before the start of the season, no doubt."

Restricted Free Agents

Daniel Rich (Brisbane Lions); Nathan Brown, Steele Sidebottom (Collingwood); Jack Grimes, Jack Watts (Melbourne);Ty Vickery (Richmond);Sean Dempster, (St Kilda).

Unrestricted Free Agents

Ricky Henderson, Scott Thompson, Nathan Van Berlo (Adelaide Crows); Daniel Merrett (Brisbane Lions); Dennis Armfield, Kade Simpson (Carlton); Jarryd Blair, Brent Macaffer, Dane Swan, Alan Toovey (Collingwood); Courtenay Dempsey, Heath Hocking, Cale Hooker, David Myers, Tayte Pears, Brent Stanton (Essendon); Zac Clarke, Matt de Boer, Chris Mayne, Matthew Pavlich, Clancee Pearce, Aaron Sandilands (Fremantle);Jimmy Bartel, Corey Enright, Tom Lonergan (Geelong Cats); Luke Hodge, Sam Mitchell, Brendan Whitecross (Hawthorn); Neville Jetta, Jake Spencer (Melbourne);Michael Firrito, Brent Harvey, Drew Petrie, Lindsay Thomas, Daniel Wells (North Melbourne); Paul Stewart (Port Adelaide); Sam Fisher, Leigh Montagna, Nick Riewoldt (St Kilda); Kieren Jack, Ted Richards (Sydney Swans); Mitchell Brown, Sam Butler, Patrick McGinnity, Will Schofield (West Coast);Matthew Boyd, Will Minson, Dale Morris, Robert Murphy (Western Bulldogs).