When you factor in the precious away goal Tefana secured at Kiwitea St when substitute Axel Williams struck with 20 minutes remaining, Auckland's task is a challenging one.
"Obviously we would have preferred to have a bigger lead but unfortunately we couldn't choose the score," Auckland coach Ramon Tribulietx said. "An away goal is always important but that doesn't mean we can't score away either. If we play the same way I'm pretty sure that we're going to create the same chances.
"I would've have chosen not to concede, but that's the reality - we've got to relax and focus on this game."
Tefana's imposing home advantage is three-fold - the heat, a vocal crowd and an artificial pitch. While not much can be to temper the first two factors, Auckland trained on a similar pitch at a local high school before flying out earlier this week.
"We've been training on an artificial turf which is going to give us a little bit of practise," Tribulietx said. "But, obviously, they play their home games there, they train there, so they've got more practise than us.
"They were difficult in Auckland and they're going to be even more difficult up here."
That scenario appeared unlikely after Tefana's first game in the competition. They fell to a 10-0 loss on the opening day away to Waitakere - the biggest losing margin in the history of the O-League - but bounced back with a undefeated run in the group stages to find themselves on the verge of history.
Coach Laurent Heinis was pleased to have presided over such a dramatic reversal of fortunes but insisted his side still have much work to do to put the finishing touches on what would be a fairytale ending.
"After the result of the first leg of the final, anything is still possible," he says. "We believe Auckland are in a stronger position because they hold the lead. We are therefore the underdogs and are approaching the match from that perspective."