Collingwood coach Mick Malthouse says it's a waste of time for his club to put its point of view to the AFL about capping the number of interchanges.

Malthouse is a firm believer that the number should not be capped, but he says the AFL will not listen to the Magpies' arguments.

The AFL is likely to put a limit on the number of times a team can interchange players during games, with the restriction set to come in next year.

But Malthouse and Carlton coach Brett Ratten strongly argue that higher bench rotations help prolong the careers of players.

The league is worried that the dramatic increase in interchange numbers in the last few years has meant more injuries during games.

Collingwood have been a trendsetter among the clubs using the interchange bench much more often, often as a tactical ploy.

But Geelong's Mark Thompson is one prominent coach who has said he would have no problems with an interchange cap.

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