V'Landy's made a good point though about NRL players being young and fit are unlikely to be seriously ill. However, as the only reporting of confirmed cases will in likelihood come from hospital admission and testing data people diagnosed positive will not have to disclose if they are sent home to manage the condition. Therefore it would be very unlikely the NRL would release names of affected players although they may say "there is a confirmed case." This is because essentially, all our health information is covered under the Privacy Act.
For example, with tin foil hat firmly in place, I find it suspicious that one player was sent for testing after presenting with symptoms but the diagnosis was not COVID-19, "just" pneumonia which is exactly why people die from this virus. They develop pneumonia.