Collingwood is set for a busy draft period next week after 13 players from their 2020 roster were moved on via delistings, retirements or trades.

The Magpies currently have 30 senior-listed players along with four rookies ahead of the National Draft, with the club required to select at least six players or opt for delisted free agents, per AFL Media's Mitch Cleary.

Defender Tom Langdon was the latest to depart the Holden Centre after he announced his retirement on Monday.

The Magpies lost quartet Adam Treloar, Jaidyn Stephenson, Tom Phillips and Atu Bosenavulagi in the trade period without gaining any names in return.

The club also delisted Flynn Appleby, Tim Broomhead, Matthew Scharenberg and Rupert Wills, while Ben Reid, Dayne Beams, Lynden Dunn and Travis Varcoe join Langdon in retirement.

Collingwood will take picks 14, 16, 65, 70, 75, 92 into next Wednesday's draft.