The challenges keep coming for the AFL season with South Australia opting to keep its borders closed to Victorians amid the state's worsening COVID-19 tally.

It comes after Queensland enforced tight quarantine laws yesterday around contact with Melbourne teams after the state recorded 75 new cases.

SA were originally set to open their borders on July 20, which would've allowed Adelaide and Port Adelaide to fly back in after their scheduled matches on July 17 and 18.

But under the new laws the SA clubs would need to quarantine for two weeks upon returning.

SA's change of plans creates even more headaches for the AFL's ever-changing fixture.

SA Premier Steven Marshall said “we know this will have a dramatic effect on the AFL”.

“Any teams coming in from Victoria to South Australia will have to do two weeks of isolation,” he said.

“Any South Australian team that is coming back from Victoria or goes to Victoria to play a team (there) will have to do that two weeks of isolation on return to our state.”

It will make it difficult for clubs to fly in and out of Adelaide and could pave the way for a hub in New South Wales.

Brisbane and Gold Coast would likely need to make their way home through NSW before returning home form their trip to Victoria.

The Suns play Geelong at GMHBA Stadium this weekend, while the Lions face Collingwood at the MCG in Round 6.