Olympic 1,500 metres champion Taoufik Makhloufi has withdrawn from the Tokyo Games due to a knee injury, he wrote on Facebook.
The 33-year-old Algerian, who secured gold in London 2012, said he was not in top form due to the injury and that it was with a heavy heart that he would not be flying to Japan.
Australia's medal hope in the event is Stewart McSweyn, who confirmed his focus on the 1500-metres by dropping the 5000m and 10,000m despite earning selection in both longer distance events.
Makhloufi said he now wants to concentrate on the World Athletics Championships in the United States next year.
Makhloufi took the silver medal in the 800m and 1,500m in Rio de Janeiro in 2016.
Australian Associated Press