The International Association of Athletics Federation banned Russia from the sport last week after a stunning World Anti-Doping Agency report that alleged unprecedented doping offences.
IAAF president Sebastian Coe has said Russia can only return to competition once they prove they have set up a new framework to stop doping.
Norwegian anti-doping expert Rune Andersen, who is heading the five-person inspection panel into Russia's athletics team, told Reuters he did not rule out the chance of Russia putting their house in order in time for the 5-12 August Rio Games.
“It is impossible to say whether there is enough time to do something with this situation. Whether it is one month, two months, a year, it’s impossible to say,” Andersen said during a break in the WADA executive committee meeting on Tuesday.
