Sydney - Wallabies and Brumbies winger Henry Speight was on Wednesday ruled out of the Rio Olympic rugby sevens tournament with a ligament injury.
Speight, who was on the comeback trail after an eye injury earlier this year, hurt his right knee during a training game on Tuesday and is expected to be sidelined for 12 weeks.
"We're all gutted for Henry," said Australian men's sevens head coach Andy Friend.
"He made a commitment to the program and has done everything he possibly could to get himself in the frame for Olympic selection."
The Fijian-born Speight, 28, played in the Dubai and Sydney sevens tournaments this year, scoring two tries.
He is not in the Wallaby squad that is currently playing a three-Test series against England.
Rugby is returning to the Olympic schedule in Brazil this year after a gap of 92 years.