The odds are building up against on-leave House Speaker Peter Slipper, with a key MP urging him to stay out of the picture at least until he clears his name while the Coalition may field a likely successor to his post.

New England MP Tony Windsor called on mr Slipper to extend his vacation to the point where he had hurdled all the accusations hurled at him.

The embattled house speaker is fending off allegations that he abused his Parliamentary entitlements through misuse of Cabcharge vouchers plus the sexual harassment claims of a former male media aide.

On Sunday, Mr Slipper announced that he would stand aside pending the resolution of the Cabcharge allegations but Mr Windsor strongly suggested today on the house speaker that he should consider prolonging his leave and probably save his reputation.

"My advice to him would be to vacate the chair whilst all these inquiries are going on and not force it to a vote within the parliament," the independent MP told ABC in an interview on Thursday.

The prospect of being forcefully driven out from his post should be too much for Mr Slipper, Mr Windsor added, and "it would be a shame if a speaker of the Australian parliament was actually voted out of that position."

"I'm not suggesting that's what would happen, but it could happen," the crossbencher pointed out.

Mr Windsor's voice has been added to the campaign mounted by the Coalition, which seeks to prevent Mr Slipper from reclaiming his post unless he would be cleared of the charges arrayed against him.

Earlier, his fellow independent MPs, Andrew Wilkie and Rob Oakeshott, had pressed on the top Parliamentary official to evade the humiliation of being ousted by opting to stand aside while all his civil and likely criminal liabilities were being resolved by the courts.

Mr Windsor assured too that he would "defend (Slipper's) role vigorously to go through the due processes of law."

"But the important thing in my mind is the importance of the role of the speaker in our parliamentary process and there seems to be an unfolding story going on here," he added.

The crossbencher stressed too that he was not inclined to prejudge Mr Slipper and admitted "I wouldn't have a clue," specifically referring to the alleged wrongdoings committed by the house speaker, who will be temporarily replaced by his deputy, Labor's Anna Burke.

Yet this early, the Coalition has come up with a likely permanent replacement for Mr Slipper in the event that he would not return to his chair.

In an interview with The Australian, opposition whip Patrick Secker has hinted that taking the place of Mr Slipper, in case the speakership becomes vacant, is now part of his political considerations.

"I am sure I could do the job," Mr Secker told the publication on Thursday.

Labor MPs, however, viewed the apparent pre-positioning as premature, with Labor's Andrew Leigh reminding his colleagues that Mr Slipper, despite all the allegations, must be presumed innocent until proven otherwise.

"Any of us could have false claims made against us and the presumption of innocence is the right presumption to have," Mr Leigh was quoted as saying by the Australian Associated Press (AAP) as saying.