Two sources, whose names were suppressed over fears they would be "punished" or fired by Chevron, told Energy News on Monday that a worker at the Wheatstone platform had tested positive for COVID-19.
However, on Tuesday morning, a second test came back negative.
"Chevron advises a suspected case of COVID-19 at the Wheatstone offshore gas processing platform has returned a negative result, following confirmatory testing conducted by the WA Department of Health," A Chevron Australia spokesperson told Energy News.
"All protocols were adhered to and response measures were enacted immediately in line with WA Department of Health advice."
According to information obtained by Energy News, the worker was a vendor who had spent two weeks in quarantine before heading to the Wheatstone platform.
Chevron Australia and the National Offshore Petroleum Safety and Environmental Management Authority both confirmed a positive test at Wheatstone on Monday night, but urged caution stating that there was a strong chance it was a false-positive.
Chevron has since confirmed the second test was returned negative.