Australia front-row Tom Robertson requires surgery after it was confirmed he has ruptured the anterior cruciate ligament in his right knee.
The loosehead prop, who suffered the injury during a training session in Buenos Aires last week, is expected to miss six months of action.
Robertson plays Super Rugby for the Waratahs and will hope to return to the field later in that season to prove his fitness ahead of the Rugby World Cup. He could also feature during the 2019 Rugby Championship as a last opportunity to push his case for selection to head coach Michael Cheika.
The prop, who made his international debut in 2016 against Argentina, is 24 years of age and therefore should have a good chance of returning from the injury with few complications as he looks to build on his Test career.