Dr Young made the order as substantial contact tracing is undertaking to track down potentially hundreds of people that two 19-year-old girls who have tested positive to the highly-infectious virus have been in contact with since their return from Victoria on July 21.
The NSW premier also highlighted that Queensland's new cases were not directly from Sydney.
But the New South Wales premier fired back, saying the decision will hurt the "smaller state" Queensland "much more than it hurts NSW" during a Wednesday press conference.
The new case comes after Queensland Health Minister Steven Miles earlier confirmed there had been two other COVID-19 cases overnight.
Ms Palaszczuk said the closure from Saturday morning gave Queenslanders time to get home.
Queensland Premier Annastacia Palaszczuk said the growing cluster prompted her government "to move quickly" to "protect Queenslanders".
Premier of the Australian state of Queensland, Annastacia Palaszczuk declared the city of Sydney to be a COVID-19 hotspot on Wednesday, as fears of a national backslide intensified.
"I would advise Queenslanders at the moment not to travel to New South Wales", Ms Palaszczuk told reporters on Tuesday.
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However, these are transmitted by consuming contaminated food and water and can cause significant outbreaks. It is spread through contaminated blood, intravenous drug abuse and sexual contact with an infected person.
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He alleged that they had tried to "lock him up" and also claimed he wanted to divorce his wife. Kanye West's new album Donda is ready for launch tomorrow, Friday, July 24.
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But as quickly as the order was signed, the American Civil Liberties Union (ACLU) already has plans to challenge the memo. In 2019, he attempted to get a question about citizenship status on the 2020 census at the Supreme Court.
From Saturday August 1, millions of residents from Greater Sydney - alongside those already banned from the state of Victoria - will be banned from entering the state.
We do not want a second wave here.
Dr David Beirman, a tourism lecturer from the University of Sydney said the call to shut up shop to Sydneysiders will result in a further blow to Queensland's tourism industry, with operators still reeling from the state's first hard border lockdown.
"We have responded to situations in Queensland like this before", he said.
Professional sport in Australia including top-flight football has once again been plunged into chaos because of the reprecussions of Covid-19. Two of those cases are in hotel quarantine. There is also a number of close contacts in both of their households. We do not want widespread community transmission.
"There will be a thorough police investigation here but now we have to act as a community and any areas the chief health officer says need to be closed, will be closed".