MELBOURNE coach Paul Roos has called for the substitute rule to be scrapped immediately, labelling it the "worst rule brought into footy".

"It should be abolished this week," Roos said at his weekly press conference on Monday afternoon.

"It serves no purpose at all.

"It's the worst rule brought into footy, so it'd be nice for them to change it."

Roos has joined a growing list of senior coaches to call for the sub rule to go, echoing the thoughts of Adelaide coach Phil Walsh, who has led the charge to have it scrapped.

Bulldogs coach Luke Beveridge has also made his displeasure known, as did Collingwood's Nathan Buckley.

With the likely capping of interchange rotations at 80 next season, the AFL is set to review the sub rule before the start of 2016.

Roos said the interchange cap, now at 120 per match, made the sub redundant.

He revealed he spent up to four hours a week thinking about which player would don the green vest at the start of a game.

"I don't think it affects anything other than the vest gets stuffed in the drawer and we won't have to worry about it," Roos said.

The substitute rule was introduced before the start of the 2011 season in a bid to slow down the game and offset the disadvantage teams faced when a player was lost to injury.