Wasps beat Ulster to help Saracens into the last eight of the European Champions Cup.
Scott Sio signed a deal with the Wallabies and Brumbies until at least the end of 2022.
Saracens secured the European Champions Cup for a third time in four seasons after it rallied from a first-half deficit to defeat Leinster 20-10 at St James' Park.
Glasgow Warriors kept their nerve to secure a bye to a home Pro14 semi-final, while Ospreys and Scarlets are set to battle for the final European Champions Cup place.
Billy Vunipola reaffirmed he had no intention of hurting anyone with his support for Israel Folau after playing a starring role in Saracens' European Champions Cup victory over Munster.
Owen Farrell's trusty boot propelled Saracens to a 32-16 victory over Munster and a place in the European Champions Cup final for the fourth time in six seasons.
Reigning champion Leinster reached the European Champions Cup semi-finals with a gritty 21-18 victory over Ulster.