Colleagues of embattled Health Minister Sussan Ley say her position has become "completely untenable" and do not expect her to resume her place in cabinet despite her insistence she will soon return to her ministerial duties.

Ms Ley has been hit by a stream of revelations about her use of taxpayer-funded entitlements including her purchase of an $800,000 investment property on a taxpayer-funded trip to the Gold Coast and her frequent use of expensive charter flights to travel on busy capital city routes.

At a media conference on Monday, Ms Ley, who has been stood down from the ministry pending an investigation by the head of the Department of Prime Minister and Cabinet, said she was confident she would quickly resume her place in cabinet.

But fellow Liberal MPs, speaking on condition of anonymity, told Fairfax Media the overwhelming view within the party was that Ms Ley's ministerial career was over.