If Healy ultimately did not make the Test, then Tahlia McGrath would again stand in as captain.

"We're pleased with the form of the 13 players that have taken part in the series to date and feel it's a squad that offers a variety of options when it comes to selecting the makeup of the Test side," national selector Shawn Flegler said. "Alyssa has been named in the squad as a batter only and we'll give her as much time as we can to prove her fitness ahead of the match. Ash will continue to be assessed daily at this stage, she is on track to be available for the Test match."

Mooney's experience wicketkeeping in longer-form cricket is limited and she is aware it will be a new physical challenge.

"I don't think I'll be able to walk after if I have to keep but we're pretty lucky in the Australian team where we've got lots of players that can step into different roles," she said after the first T20I. "But when [Healy's] been out, I've been able to step into that role and got some good feedback along the way, so just happy to do what's required of the team."

If Voll did debut at the MCG, it would complete a full set across the three formats in less than two months following the start of her ODI career against India and then a T20I debut at the SCG.

"I'm more than happy to try and do a job up the top of the order," Voll told reporters in Canberra on Tuesday. "I love batting there and batting up the top with Beth Mooney was pretty cool [in Sydney]. I'm more than happy to fit in wherever the team needs."

Megan Schutt has again been named in a Test squad despite often saying her days in the format are over, but the pink-ball day-night element to this game may see her come into consideration for the final XI.

The other decision that will need to be made is whether to play both Alana King and Georgia Wareham, who have caused England huge problems in the limited-overs matches.

The match will be the first day-night Test at the MCG and the first women's Test match at the venue since 1948-49.

Australia squad for Ashes Test

Alyssa Healy (capt), Darcie Brown, Ashleigh Gardner, Kim Garth, Alana King, Phoebe Litchfield, Tahlia McGrath, Beth Mooney (wk), Ellyse Perry, Megan Schutt, Annabel Sutherland, Georgia Voll, Georgia Wareham