Brown, who was likely to get the job on Swans full-forward Barry Hall, has been replaced by Shannon Cox.
Collingwood said Brown was suffering from general soreness.
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Magpie Nathan Brown is a late withdrawal for the big clash with the Sydney Swans
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In the spirit of reconciliation the AFL acknowledges the Traditional Custodians of country throughout Australia and their connections to land, sea and community. We pay our respect to their Elders past and present and extend that respect to all Aboriginal and Torres Strait Islander peoples today.
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