The Wallabies, who have lost to Wales and Fiji, look to be heading out of the tournament after Fiji came from behind to claim a narrow win over Georgia on Saturday.
There are major questions around the state of Australian rugby and there is little doubt Jones is fighting for his job.
While minnows compared to Australia, Portugal have won plenty of admirers for their attacking style in France and must be licking their lips at the prospect of playing them in this kind of form, having given Wales a tough clash and drawn with Georgia.
Date, kick-off time and venue
Australia vs Portugal is scheduled for a 4.45pm BST kick-off time on Sunday October 1, 2023.
Saint-Etienne’s Stade Geoffroy-Guichard will host the match.
Where to watch Australia vs Portugal
TV channel: The game will be broadcast live in the UK and free to air on ITV4. Coverage begins at 4.15pm.
Live stream: ITVX, free with a subscription, will offer a live stream service online, plus the ITV website.
Australia vs Portugal team news
Jones has made three changes from the Wales debacle, the headline news relating to the complete dropping of Samu Kerevi - who is not injured.
Waratahs duo Lalakai Foketi and Izaia Perese are selected in the centres instead, with Jordan Petaia also not involved at all.
The other alteration is in the back row, where Fraser McReight replaces Rob Leota.
There are four changes from Portugal head coach Patrice Lagisquet from the team that played out that thrilling 18-all draw with Georgia.
All come in the pack, with David Costa, Martim Belo, David Wallis and Thibault de Freitas all starting.
Australia vs Portugal lineups
Australia XV: Kellaway; Nawaqanitawase, Perese, Foketi, Koroibete; Donaldson, McDermott; Bell, Porecki (c), Slipper; Frost, Arnold; T Hooper, McReight, Valetini
Replacements: Faessler, Schoupp, Fa'amausili, Leota, Kemeny, Fines-Leleiwasa, Gordon, Vunivalu
Portugal XV: Guedes; Storti, Bettencourt, Appleton (c), Marta; Marques, Portela; Costa, Tadjer, Ferreira; Madeira, M Belo; Wallis, Martins, De Freitas
Replacements: Fernandes, Diniz, Bruno, Cerqueira, Simoes, J Belo, Moura, Pinto
Australia vs Portugal referee
Georgian referee Nika Amashukeli will oversee proceedings in Saint-Etienne on Sunday afternoon.
Australia vs Portugal prediction
Australian rugby might be in a state of flux at the moment but it is simply too hard to imagine them losing, even if – within the context of the tournament – it would be fitting of their campaign thus far.
Australia to win.
Head to head (h2h) history and results
The two nations have never played before in a competitive international.
Australia vs Portugal latest odds
Australia to win: 1/40
Portugal to win: 22/1
Odds via Betfair (subject to change).