It’s semi-finals time in Super Rugby Pacific and the first final-four showdown sees the Brumbies make the trip across The Tasman to face the Blues in Auckland on Friday night.

Saturday could be the last time the Melbourne Rebels take the field in Super Rugby Pacific as they make the trip to Wellington to face the Hurricanes, while the Brumbies are also in quarter-final action at home to the Highlanders.

The Brumbies are sweating on scans on the knee of promising teenager Rob Valetini after his Super Rugby debut ended after 20 minutes.

Richie Arnold's move to the Brumbies from the defunct Western Force could lead to Super Rugby history being created with twin brother Rory on Saturday.

Wallabies lock Rory Arnold will start on the bench for the Brumbies' opening Super Rugby game, with twin brother Richie taking his run-on spot.