Supporters of West Australian Labor leader Mark McGowan insist the majority of caucus do not want former federal politician Stephen Smith to step into the role and have accused him of damaging the party.
Mr Smith has told the Sunday Times newspaper he will consider leading the party if it will help them win next year's election, but Labor spokesman for Corrective Services Paul Papalia says no one wants him.
"We don't need a leader. We've got a leader," Mr Papalia told 6PR radio on Sunday.
Mr Papalia described the leadership speculation as "lunacy" and said Mr Smith was damaging the party.
"The Barnett government needs to go. We need to have a strong, viable alternative and what Stephen is doing is undermining that alternative," he said.
Mr Papalia said those pushing for Mr Smith to take over were helping Premier Colin Barnett cement himself and also prevented the state government from being scrutinised.
Labor's legislative council leader Sue Ellery also insisted Mr Smith did not have the support of the majority of caucus members.
"Stephen said he's ready if asked. We are not asking. There is not a majority of caucus members who support him, in fact the majority is horrified," she said.
Ms Ellery said there was no seat available for Mr Smith and there was nowhere near 50 per cent of caucus even thinking about changing leaders.
"Stephen is trying to damage the WA Labor brand by trying to insert the kind of leadership destabilisation that he was a part of when he was in government at a federal level," she said.
"That culture is so toxic that it invades every part of your being, but he needs to get the message absolutely clearly - WA Labor doesn't want it and WA does not want that kind of behaviour."
Mr Smith and Mr McGowan will hold separate press conferences later on Sunday.
