South Australia will continue to monitor emerging COVID-19 cases in Sydney and is not yet ready to lift restrictions for travellers from Melbourne, Premier Steven Marshall says.
SA has banned people who visited virus exposure sites in NSW from entering the state and has asked people who arrived before the ban to quarantine for 14 days and get three virus tests.
Travel bans also remain in place for people from Greater Melbourne.
On Friday, a man in his 50s was confirmed to have COVID-19 after "fleeting" contact with an infected shopper at Bondi Junction last weekend.
At the same time, authorities in Victoria reported one new locally acquired case in a primary close contact of an existing infection.
Mr Marshall said SA was always concerned by the emergence of any new cases and would continue to monitor the situation in NSW.
"At the moment we're adopting a hotspot orientation, but we do need to look at what the genomics are, where people are and the testing results that will come in over the next couple of days," he said.
"If we do need to make further changes, then we'll update the people of South Australia as quickly as possible."
The premier said SA authorities were less concerned about the situation in Melbourne but were not yet ready to fully relax travel rules.
"There's still very heavy restrictions with mobility over in Victoria," he said.
"We're not going to take a risk in South Australia ... but we will lift those restrictions as soon as it is safe to do so."
On Friday, the state government also confirmed the commonwealth had given final approval for a quarantine hub in Adelaide for international students.
A flight training site at suburban Parafield has met infection control requirements.
It will be able to take up to 160 students at a time where they will isolate for 14 days and be tested for COVID-19 each day.
The first students are expected to arrive in August.
The number of student arrivals will not impact on how many repatriated Australians can return through SA, with the universities or the students to cover the cost of travel and isolation.
The state government said approval for the scheme recognised the work done by its agencies and the international education sector to deliver a safe and secure plan.
"International education is a significant part of South Australia's economy, contributing over $2 billion in 2019," Mr Marshall said.
"International students add so much to South Australia's multicultural fabric along with the clear economic benefits for our CBD and our state overall."
However, Mr Marshall said the health and safety of South Australians remained the government's number one priority and there was still some work to be done to finalise arrangements before the first students arrived.
SA reported three new virus cases on Friday, all in returned travellers.
The state has six active infections, all people in quarantine.
Australian Associated Press
Sign up for our newsletter to stay up to date.