The Health Minister, Kim Hames, has left the door open to privatising support services at Perth's major hospitals if a pilot project at Fiona Stanley is successful.

The Government is calling for expressions of interest from the private sector to provide non-clinical services such as cleaning, security, and reception at Fiona Stanley when it opens in 2014.

Dr Hames says he will make sure the standard of patient care is not affected by the move.

He says he is not currently considering rolling out the initiative at Royal Perth, Sir Charles Gairdner and Fremantle Hospitals.

"I have said very clearly that in this term of government we will not be touching those three hospitals," he said.

However he says if the pilot project is successful he would consider expanding it to the other hospitals, but only after making his intentions clear leading up to the next election.

"I think that would be the reasonable thing to do," he said.

"That if we are of the view that it needs to be expanded further then we should make that very clear leading to the election. There would need to be a significant difference in costs for that to occur."

Dr Hames has conceded that previous attempts to privatise cleaning services at Royal Perth in the 1990s were a failure.