Tom Robertson

Alaalatoa was in the side to face Ireland at Suncorp Stadium in Brisbane Saturday, however, the Brumbies prop succumbed to a knock to his ankle sustained during training Thursday.

Australia have now added Robertson to the bench in response to the 24-year-old's injury, it was announced Friday.

Waratahs prop Robertson has not featured for the Wallabies since last year's clash with England at Twickenham in November.

Robertson's renewal is for a further three years, tying him down to the ARU and Super Rugby's the Waratahs until 2020.

The 23-year-old, who made his debut for the Wallabies against South Africa last year and has since amassed 15 Tests, said: "New South Wales is home for me. I'm very passionate about the Waratahs and Wallaby jersey and it means so much to me to get the chance to pull them both on.

"There's plenty still to do this season with the Wallabies, but I'm also really excited about next year with the Waratahs.