Australia are planning to use prop Scott Sio as a possible third hooker during the Rugby World Cup.
The Wallabies raised a few eyebrows last week when they named only two specialists in the number two berth - captain Stephen Moore and experienced hooker Tatafu Polota-Nau.
Scrum coach Mario Ledesma admitted to the media on Wednesday that Sio would be the man to step in during the short-term should the Wallabies need him.
"If we have an injury that lasts only one week, we'll make the prop play,” Ledesma told the Sydney Morning Herald.
"If it lasts longer, we just have to get the other hooker [James Hanson from the train-on squad] who has been training with us every day.
"He is working as a prop, and a little time here and there we will be working [on hooking]. But I'm real comfortable with 'Taf' and 'Squeak' [Moore] and if they get a serious injury, the third hooker will come.”