The South Australian government has approved a reduced-capacity AFL crowd for the 50th Showdown between Adelaide and their arch rivals Port Adelaide.

The Crows will host the Power at Adelaide Oval on Saturday night in front of up to 15,000 fans under strict COVID-19 protocols.

It comes with crowds at AFL matches still limited to 10,000 in Tasmania and banned entirely in Victoria for at least one more week.

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However, there is growing optimism limited crowds will be allowed to return in Victoria in round 22, after no new community cases of COVID-19 were reported on Wednesday.

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Full-capacity crowds are allowed in Western Australia.

SA Health has advised seats at Adelaide Oval will be separated by two empty rows to maintain social distancing.

Fans must wear a mask at all times - except when eating and drinking, which must be done while seated - and all post-game activities have been cancelled.

"Any game we can play in front of our members is always going to be welcomed and much appreciated," Crows CEO Tim Silvers said.

"In a perfect world we would like to have a full house so as many of our supporters can attend but we obviously understand and support the measures that have been put in place to keep everyone safe.

"We also acknowledge this situation will not cater for all of our passionate members and we trust they will be understanding given these uncertain and challenging times."

The Showdown will be Adelaide's first home match in three weeks after they were forced to spend time temporarily based in Melbourne.

A Crows home game against Hawthorn in round 19 was relocated to Marvel Stadium.