Luke Beveridge and John Longmire will be at odds come Saturday's Grand Final, but the pair agrees on one thing: they don't want any part of an historic extra-time decider.

The AFL changed its rules regarding drawn Grand Finals in April, meaning there'll be no coming back next week for the Western Bulldogs and the Sydney Swans, as has been the case three times in League history, with the most recent being the drawn Collingwood-St Kilda game in 2010. 

If the scores are level at the end of regular time on Saturday, the two sides will contest two five-minute halves each way, plus time on, to decide a winner. 

If it's still a tied game at the end of the second period, the siren will not sound until the next score – either a point or a goal – which will decide the flag.

When asked about if they had contingency plans in place should a draw occur, both coaches looked at each and shuddered at the prospect.

"Let's hope it doesn't happen," Beveridge laughed.

If it does, the Swans might have an advantage, with Longmire part of an extra-time final in his playing days with North Melbourne.

In the qualifying final against Hawthorn back in 1994, champion Kangaroos captain Wayne Carey kicked the last goal of the final quarter to force the game into extra time.

The star forward then booted the sealer in extra time to send North into a preliminary final, and finished the day with an incredible 32 touches, 10 marks, and four crucial goals. 

"I was actually part of one when it first happened out at Waverley a long time ago," Longmire recalled with a grin.

"In extra time 'The Duck' (Wayne Carey) turned on a show, which was handy.

"We might have to ring him up and get him down there once the siren goes."