The ACT Brumbies' preparations for Saturday's Super Rugby match against Waikato Chiefs have been hampered by an outbreak of mumps.
Rugby Australia said that a small number of cases of the viral infection had been confirmed among Brumbies players and staff and that only those who were completely healthy would be allowed to travel.
"Rugby Australia, [governing body] Sanzaar and the Brumbies, as well as ACT Health and relevant public health authorities in New Zealand, will continue to monitor the situation," the association said.
All the confirmed and suspected cases of the virus were being kept in isolation for at least five days after the onset of symptoms, it added.
All three of the teams that played against the Brumbies in the opening rounds - Queensland Reds, Melbourne Rebels and Otago Highlanders - had been asked to monitor their players and staff.
No further cases had been reported so far.