South Australia has taken precaution to keep Covid-19 out of its community by slamming its borders shut to Greater Melbourne.

Premier Steven Marshall announced on Wednesday afternoon that restrictions will come into effect as of 6pm tonight.

It means anyone from Greater Melbourne will not be permitted to enter the state after that time. Only those with exemptions or essential workers will be given the green light but must quarantine for 14 days.

South Australian residents will also be allowed to return home after the 6pm cut off but must quarantine at home for two weeks.

Those people already in the state who returned from Greater Melbourne from May 20 must get tested on days one, 5 and 13 and need to isolate until they receive a negative result.

Mr Marshall also advised people travelling from the Bendigo LGA can enter SA but must have a test on day one, 5 and 13 until a negative result.

SA chief public health officer Nicola Spurrier explained the border restrictions were imposed because of the “concerning” large number of exposure sites right across Melbourne.

She said there was “no end date” set to lift the restrictions.

Professor Spurrier also confirmed three South Australians are considered close contacts of an infected person who attended the AFL match between Port Adelaide and Collingwood at the MCG on Sunday.

Two of those people have already returned to the state while the third remains in Victoria.

There were also 464 other locals that sat the same area of the stadium and are required to isolate.

Professor Spurrier advised those South Australians that attended the game to get tested, regardless if they are symptomatic.

“Even if you don’t have symptoms it might be a good idea to get tested,” she said.

Victoria revealed six new locally acquired cases on Wednesday.

SA recorded two new infections recorded on Wednesday, a man in his 50s and a man in his 20s, who were both returned travellers in hotel quarantine.

Earlier a Victorian man was revealed as the likely missing link in Melbourne’s outbreak after he caught the virus while quarantining in the Playford Hotel.

He returned home to Melbourne on May 4 after completing his mandatory isolation and developed symptoms four days later.

More to come