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.
France have made two changes to their starting line-up against Argentina, with Yoann Huget selected for the first time in a year.
Sale Sharks have moved to fill their need in the back row by signing Jean-Luc du Preez from Super Rugby side the Sharks.
Jordan Petaia will become Australia's youngest debutant for a decade in a much-changed side in Padova.
Steve Hansen has made just one enforced change for the All Blacks' showdown with Ireland, Ryan Crotty coming in for Sonny Bill Williams.
Joe Cokanasiga comes into the side as Eddie Jones makes 11 changes to the England team that started against New Zealand.
With Faf de Klerk on club duty with Sale Sharks, Embrose Papier will make his first South Africa start on Saturday.
Kieran Marmion thinks Auckland-born Ireland international Bundee Aki "won't hold back" when he faces New Zealand on Saturday.
Long-serving duo Jamie Jones-Buchanan and Carl Ablett will remain with Leeds Rhinos and Luke Briscoe has also signed a new deal.
Having joined the RFU in 2011 and been chief executive since September 2017, Steve Brown has announced he will leave at the end of the year.