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The FIFO worker flew to Fortescue Metals Group s Cloudbreak mine on July 20.
He was at the airport at the same time as a positive COVID-19 case who flew in from Queensland after completing hotel quarantine there.
While investigations are still underway, health authorities believe this is the most plausible explanation for the man recently testing positive.
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WA Premier Mark McGowan announced the possible new case at a snap press conference this afternoon.(Nine)
Mr McGowan said the man had returned a very weak positive test result, first testing positive before testing negative.
The man is asymptomatic and likely not currently infectious, but the suspicion is that he may well have been positive at some point in time while in the community .