"I guess there's no such thing as certainty in today's world so I can't say 10 (out of 10), but I'm going to say nine out of 10," Roberts told News
The chances of T20 World Cup in Australia are also looking dim in the prevailing circumstances as it could either be shifted to 2021 while India hosts its edition in 2022.
"With the variable being, who would know whether we can have crowds I'd be really surprised if we can't get the Indian tour away.
But I wouldn't, hand on heart suggest we'll have full crowds from the start. We'll just have to see how that goes," the under-pressure chief executive said.
However, when it comes to away tours, Roberts wants a bio-secure environment which might prompt Cricket Australia
to explore options of sending a team for a white ball series in England.
As India's tour is a lucrative one, it is unlikely that Australia would host Afghanistan for a one-off Test, which is not a part of the World Test Championship schedule.
But before that, the CA would wait and watch how the Pakistan and the West Indies tours of England pan out in terms of health safety measures.
"I think there's some chance we could send a team over," Roberts said.
"Obviously we won't jeopardise the safety of the players, but the best test of that is that the West Indian and Pakistan tours of England before we're due to tour. We hope they go off without a hitch," Roberts said.