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MELBOURNE defender Lynden Dunn looks likely to join Collingwood, with a trade deal close to being finalised.

The Magpies are focused on replenishing their backline stocks after key defender Nathan Brown joined St Kilda as a free agent on Sunday and with fellow tall Jack Frost likely to join the Brisbane Lions on a three-year deal before the trade deadline closes on Thursday.

AFL.com.au can confirm Collingwood has had discussions with Melbourne about Dunn, 29, and understands the clubs are close to agreeing to a trade that would send a late draft pick to the Demons.

Dunn's departure would also help Melbourne find the salary cap space to fit former Hawthorn vice-captain Jordan Lewis and wantaway Essendon defender Michael Hibberd onto its 2017 list.

Collingwood has also expressed some interest in out-of-contract Fremantle defender Alex Silvagni, as reported by AFL.com.au on Monday, but Dunn is believed to be a greater trade priority.

Dunn played just four senior games in 2016 despite strong form in the VFL with the Casey Scorpions.

He is contracted to the Demons for 2017.

The former Calder Cannon has played 165 games at Melbourne after being taken at pick No.15 in the 2004 NAB AFL Draft.