Weepu back in action for All Blacks
The return of Weepu, who was relegated to the bench for last week's 49-28 mauling of the Wallabies in Melbourne after missing some training because of the birth of his first child, is one of three changes to the New Zealand squad.
Cowan's rib injury means a place on the bench for halfback Alby Mathewson, while dynamic Australian-born back Benson Stanley comes in for Israel Dagg among the replacements.
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Hide AdThe All Blacks will be chasing their fourth win in four Tri-Nations Tests on Saturday.
Meanwhile, SANZAR says a misconduct charge against South Africa rugby coach Peter de Villiers will be heard in Cape Town on Friday.
De Villiers is charged with breaching SANZAR's Code of Conduct in comments made on 21 July on Australian television, when he criticised the performance of Tri-Nations referees.
New Zealand (to play Australia): Muliaina, Jane, Smith, Nonu, Rokocoko, Carter, Weepu, Read, McCaw (captain), Kaino, Donnelly, Thorn, Franks, Mealamu, Woodcock. Subs: Flynn, Franks, Whitelock, Vito, Mathewson, Cruden, Stanley.