James Aish leaves the field with his injury. Credit:AAP

Collingwood's brave performance against Richmond at the MCG has come at a cost with the Magpies losing three players to injury for the must-win game against the Brisbane Lions at the Gabba.

The Magpies confirmed that midfielder James Aish, forward Ben Reid and defender Brayden Maynard were out with Aish expected to be in a brace for the next four weeks after suffering a PCL injury against the Tigers while Reid and Maynard will miss between one and two games.

Collingwood football manager Geoff Walsh told the club website Reid's Achilles injury could have been much worse and the Magpies were relieved he would only miss two games while Maynard suffered an ankle injury.

"I would think Ben is a one-to-two week proposition with that injury, but fortunately he got out of it without anything more serious than that," Walsh said.