The South Australian Liberal Party has been asked to declare whether it will do an election preference deal with One Nation after a “bizarre late night statement”.

State Labor minister Blair Boyer has challenged Liberal leader Ashton Hurn to make a “clear, definitive statement” about whether or not a preference deal is likely for the March 21 state election.

It comes after Liberal director Alexander Hyde released a statement on Monday night saying that the party’s approach to preferences was clear, in that it wanted “to elect as many Liberals and as many centre-right parliamentarians as possible”.

“One Nation leadership is aware of our approach,” he said.

Boyer said Hurn should state if this was the Liberal Party of John Howard, who repeatedly refused to preference One Nation, or one where “anything goes and deals are done by factional overlords”.

On Tuesday, Hurn said conversations about preferences were “always ongoing”.

“They’ve been ongoing for some time now, but that’s not just with One Nation, that’s with other minor parties and independents – certainly, no decision has been made,” she said.

“We want to see as many centre right candidates elected [as possible],” she said.

A YouGov poll published last Friday showed the state opposition languishing at 20 per cent of the primary vote, behind One Nation on 22 per cent.

Labor enjoyed a 59-41 per cent lead over the opposition on a two-party preferred basis.

On Monday, a DemosAU/Ace Strategies Poll done exclusively for InDaily showed Labor has 38 per cent support in the upper house, followed by One Nation on 21 per cent, the Liberals with 15 per cent, the Greens on 11 per cent and Family First with 4 per cent.

Hyde’s statement was responding to a One Nation media release, in which it claimed SA Premier Peter Malinauskas had “confirmed Labor and the Liberals will work together to confront One Nation’s challenge to a cosy two-party system”.

One Nation said Malinauskas had claimed both Labor and the Liberals had “rules to put One Nation last on how-to-vote cards”.

Boyer did not directly answer when asked to comment on the claim that Malinauskas had confirmed that Labor and the Liberals would work together to confront One Nation.

But Hyde said there was “no agreement or deal to preference One Nation last, there has been no discussions of such a deal and there will not be”.

-AAP