Health authorities have issued an alert in Melbourne after discovering an adult with measles attended the MCG along with 95,000 other fans on Saturday.
Two new cases of the highly infectious disease have been diagnosed.
The Department of Health and Human Services says the pair — a man and a woman — visited several crowded locations while infectious between September 20 to September 23, before they were diagnosed.
They used Metro trains and visited a pharmacy, a gym and a bar in Richmond, with one of them also visiting the MCG.
Deputy Chief Health Officer Dr Brett Sutton said measles could cause serious illness, particularly in very young children and adults.
"Measles has an incubation period of up to 18 days so those at risk of measles who visited these locations might show symptoms up until October 13," Dr Sutton said.
Measles is a highly infectious viral disease that can cause serious illness, particularly in very young children and adults.
Dr Sutton said people at risk of measles should be alert to the symptoms.
"The illness usually begins with common cold symptoms such as runny nose, red eyes and a cough, followed by fever and rash," Dr Sutton said.
"The characteristic measles rash usually begins three to seven days after the first symptoms, generally starting on the face and then spreading to the rest of the body.
"Anyone developing symptoms is advised to ring ahead to their GP or hospital first and tell them that they have fever and a rash."
Dr Sutton said most cases of measles in Victoria were linked to international travel.
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