Parling played for the Rebels in 2018 and has made successful transition into coaching, engineering the Melbourne lineout over the past two years.
In Super Rugby AU, the Rebels had the best lineout success (88 per cent), ahead of the Brumbies and Waratahs (both 83 per cent).
Brumbies coach McKellar was the first target for the Wallabies, but told Dave Rennie he wanted to remain working in Canberra this year after his assistant Peter Hewat opted to take up a role in Japan.
