Brumbies have been dealt a huge blow ahead of the Super Rugby season, with scrum-half Tomas Cubelli needing surgery after rupturing a tendon in his knee.
The Argentina international suffered the injury during a trial match against Waratahs in New South Wales on Saturday.
Cubelli ruptured his patellar tendon in the first half of Brumbies' 53-17 loss, the severity of the injury confirmed in Sydney on Monday.
Brumbies said the 27-year-old would undergo surgery on Tuesday and "will miss the start of the Super Rugby season as he begins his recovery".
Crusaders are the opponents for Brumbies in their season opener on February 25.