Collingwood's horror 2004 run in the medical room has continued with captain Nathan Buckley set to miss at least a month after re-injuring his hamstring.

Buckley's comeback after three games out with a back-related hamstring injury lasted little more than a quarter of Saturday's shock loss to Carlton.

With vice-captain Scott Burns and ruckman Josh Fraser already out of action with hamstring injuries, the bottom-placed Magpies are now being found wanting for depth.

It's a far cry from the previous two seasons when they qualified for successive grand finals with few serious injury problems.

"I don't really want to get involved in how long (Buckley will be out)," said Collingwood coach Mick Malthouse.

"That's up to the medical staff and we know he's got to work hard.

"It's one of those things, with his age and the number of hamstrings he's had, you've got to be careful with him."

Brisbane full-forward Alastair Lynch is set to be sidelined for a month after tearing ligaments in his ankle in Saturday night's 44-point win over the Kangaroos.

Kangaroos forward Corey McKernan will miss 2-3 weeks after straining his quad muscle while kicking for goal early in the match.

Fremantle youngster Byron Schammer will be closely monitored after suffering nerve damage in his forearm after being crunched by St Kilda's Brent Guerra on Saturday.

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