Victoria's COVID Commander Jerone Weimar said a further two cases have been recorded early this morning linked to the MCG.
He said those cases were in addition to the 10 reported in the past 24 hours (seven of which he reported yesterday).
"Both these cases put us in a very serious position," he said.
Mr Weimar said it was understood the new cases were not known contacts to previous cases and were sitting in different parts of the ground.
The public health team are still searching for a connection.
He said it was possible they were stranger-to-stranger transmission.
Mr Weimar said the outbreak was 'very aggressive'.
There are 16 cases, 1500 primary close contacts and over 5000 secondary close contacts.
Asked if a lockdown was coming Mr Weimar said the situation was moving half-hour by half-hour.
He said authorities are already onto their seventh ring of COVID tracing.
Mr Weimar said the outbreak was moving more quickly than any outbreak they'd seen.
He said there were currently 16 cases total associated with two strains of transmission (the Hume family and the removalists) and 1500 primary close contacts.
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Six cases are linked to the NSW removalists who attended the Ariele aparment complex.
Four are from the apartments themselves, two are parents of a positive case.
There are three cases around the MCG/Barwon cluster - a man who spent the day at the football with a positive case from the apartments.
He has tested positive as has a nine-year-old and man in his 60s in his household.
Another two people who attended the hospital have tested positive.
Mr Weimar said the state had introduced masks because the removalists were not wearing masks, but their client was and has not tested positive.
His neighbours were not wearing masks and have now tested positive.