Collingwood will be without key midfielder Taylor Adams for the next month, while the Magpies are unlikely to have giant forward Mason Cox back for Saturday's clash with Carlton.

Adams suffered a tear to an adductor muscle against Port Adelaide on Friday night and the Magpies have estimated that he will miss the next four games, which would mean he would not return until after the bye.

Cox missed the Port Adelaide game with an ankle injury and the view is that he might not be ready to return, which would also mean veteran key-position player Ben Reid would keep his spot for the Carlton game after an encouraging showing against Port.

Collingwood's Mason Cox and Taylor Adams (far right) will both sit out Saturday's match against Carlton, with Adams expected to miss four games. Credit:AAP

The logical replacement for Adams, based on last year, would be strong and large-bodied midfielder Brayden Sier, who has been missing with a toe injury and is yet to play a senior game in 2019. But Sier's lack of preparation will almost certainly mean he resumes in the VFL this weekend.