The result of the South Australian election has been thrown further into uncertainty with reports one of the key independents is taking extended sick leave.

With a hung parliament the expected result in SA, independents Geoff Brock and Bob Such had been likely to determine which party forms government.

Labor requires the support of one of the independents to form government, while the Liberal Party would need support from both.

But Mr Brock says he has been told Dr Such is taking leave.

"Bob Such's wife Lyn rang me... this afternoon and apologised that Bob will be taking a couple of months off," Mr Brock said yesterday.

"He's got some issue and my main thoughts are with Bob and his family.

"Nothing else matters - Bob's health is the foremost issue that's on my mind at the moment."

A handful of seats remain undecided due to an unprecedented number of postal and pre-poll votes.

On Friday, it appeared likely Labor would end the vote count with 23 seats, down three, and the Liberals with 22, their four gains including one from an independent at Mount Gambier.

Mr Brock has put off planned meetings with Premier Jay Weatherill and Liberal leader Steven Marshall until next Monday.

"We're in caretaker mode. I'm not in a hurry to make any hasty decisions," he said.

"I'm going to get constitutional advice on the situation we're in at the moment."

Mr Brock is still talking to the heads of the five councils in his Frome electorate about which side he plans to support and what they hope to see in return from the next state government.

Premier Jay Weatherill says he is concerned for Dr Such's well-being and has offered his best wishes.

Liberal Party leader Steven Marshall has also given the Such family his support.