Another case was also detected in hotel quarantine, with more than 25,000 tests conducted in the past 24 hours.
There are 21 active cases in the state.
Stage four restrictions are in place across Victoria until 11.59pm on Wednesday.
Australian Open organisers are hopeful crowds will be able to return to Melbourne Park on Thursday for the final four days of the tournament.
Prior to the lockdown, crowds at Melbourne Park were only at 50 per cent crowd capacity.
To help players with a sense of atmosphere, fake crowd noise is being used across the venue.
There were concerns at the Australian Open yesterday when Greek player Michail Pervolarakis tested positive overseas, days after he played in the ATP cup event in Melbourne. He has since left Australia.
However health officials say there is no concern for Greek teammates Stefanos Tsitsipas or anybody else at the tournament, as they believe he contracted that virus once he left Melbourne.
Health Minister Martin Foley confirmed the cases and said both were linked to the Holiday Inn at Melbourne Airport and each visited the same venue on the same night.
“Both attended a private dining venue in Sydney Road, Coburg on the night of February 6,” he said.
Mr Foley said they are from separate households and have been in isolation since Friday. Both returned a positive test on the weekend.
The toddler has attended the Goodstart Early Learning Centre in Glenroy but it has not been added to the list of exposure sites. The centre is closed today.
“Goodstart Glenroy – Pacoe Vale Road will be temporarily closed after a child at the centre tested positive to COVID-19 late [Saturday] night,” a statement read.
“Families have been notified of the closure and the parents of any child who is deemed a close contact with the positive case will be contacted directly by DHHS.
“The child contacted the virus from a person outside of the centre linked to the Holiday Inn cluster.”
The centre will be deep cleaned before it is given clearance to re-open by DHHS.
The full list of current exposure sites and times are as follows:
- Yarra Trams No. 11 on February 11, 7:55am – 8:10am between Harbour Esplanade and William Street
- Yarra Trams No. 58 on February 11, 8.10am – 8:25am between Bourke Street/William Street and Queen Victoria Market/Peel Street
- Queen Victoria Market, Queen Street Melbourne, 8:25am – 10:10am Section 2 – Fruit and Vegetables, and used Section 2 – Female toilet
- Yarra Trams No. 58 on February 11, 9:40am – 9:55am between Queen Victoria Market/Peel Street and Bourke Street/William Street
- Elite Swimming, Pascoe Vale on February 8, between 5pm and 6pm
- Woolworths inside Broadmeadows Central in Broadmeadows on February 9, between 12.15pm and 12.30pm
- Ferguson Plarre Bakehouses, Broadmeadows on February 9 between 12.30pm and 12.45pm
- Oak Park Sports and Aquatic Centre, Pascoe Vale on February 9 between 4pm and 7.30pm