Collingwood will have another forced change for Monday's holiday AFL match against Melbourne at the MCG.

Coach Mick Malthouse has revealed that an unnamed player has suffered an injury in training, with the club to inform the AFL later on Friday afternoon.

The Magpies have already lost midfield Luke Ball with a groin injury and Ben Johnson with an ankle problem.

Malthouse said it was too hard to predict how long Ball and Johnson would be out of the side.

Ball has a long history of groin injuries and Malthouse said this latest setback was probably related to his previous issues.

"Players who probably have an early history of it have a long history of it," Malthouse said.

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