Wallabies and Waratahs back-rower Jack Dempsey re-signed until at least 2020.
Kieran Marmion should be fit to feature in Ireland's upcoming match against New Zealand, but Sean O'Brien will play no part.
South Africa rallied from a 14-point deficit in the second half to secure a thrilling Test victory over France in Paris.
Kieran Marmion, Bundee Aki and Luke McGrath crossed to give Ireland a largely unconvincing win over Argentina.
Having played the last time Wales beat Australia 10 years ago, Alun Wyn Jones was left feeling old after Saturday's win over the Wallabies.
For the first time since November 2008, Wales were able to celebrate victory over Australia after a tense affair in Cardiff.
New Zealand edged England in an enthralling Test on Saturday, but Owen Farrell is more concerned about beating them at the World Cup.
Sam Underhill thought he had crossed for a winning England score against New Zealand, but Courtney Lawes was deemed offside.
Georgia's hopes of earning themselves a place in the Six Nations may have taken a knock after they lost to Italy.
Having been behind as half-time approached, Scotland ultimately thrashed Fiji with Tommy Seymour scoring three of their eight tries.
New Zealand are determined to beat England to make up for drawing with the British and Irish Lions, says Steve Hansen.
The return of Stuart Hogg slightly eases Scotland's concerns, while Greig Laidlaw and Finn Russell also start against Fiji.
South Africa are able to call up European-based players against France, leading to the returns of three experienced stars.
Having rested key men against Italy, Joe Schmidt is back to a team somewhere near full strength as Rory Best captains Ireland.
Hooker Tolu Latu's indiscipline in his last two Tests has not deterred Michael Cheika from starting the hooker against Wales.
Wing Chris Ashton is preferred to Jack Nowell against the All Blacks as Eddie Jones makes three changes to his side.