Drivers have held briefings with race organisers and scaled back interaction with fans and the media, with a number of teams cancelling planned interviews with television broadcasters, while keeping reporters at arm's length during open media sessions.
Some health professionals and media pundits have criticised race organisers for pressing ahead with race week, even as infections increase in Australia.
The Australian Grand Prix Corporation has declined to comment on the viability of Sunday's race or provide any public briefing to discuss the concerns.
Sainz said he was comfortable with the advice he was receiving, but conceded there was “obviously a bit of luck involved” in holding the race under the current circumstances.
“Everyone knows how quickly this thing is developing,” he said.
“Only time will tell if this is the right or the wrong thing to do.
“I am concerned, I think like everyone else in the paddock.
“But at the same time, at the moment, in my personal situation, I am in a comfortable situation.”