Report on Judith Collins inquiry due out this week

Judith Collins resigned from her ministerial portfolios in the lead-up to this year's election. Photo / Mark Mitchell

The report from a Government inquiry into former Justice Minister Judith Collins is due out this week, Prime Minister John Key says.

Ms Collins resigned her ministerial portfolios in the lead-up to this year's election after an email emerged that appeared to link her to a blog campaign to undermine former Serious Fraud Office boss Adam Feeley.

Mr Key initiated a Government inquiry into the matter, headed by High Court judge Justice Lester Chisholm.

He told Newstalk ZB today that Justice Chisholm had indicated the report would be finished by Friday.

"We haven't had advice that the inquiry will go longer so we're expecting to get it by that date."

It would be made public "a short time after that".

Ms Collins would not immediately be reappointed to the front benches if she was cleared in the report, he said.

"But it would certainly assist in enabling her to come back.

"I've fixed my Cabinet now and I don't have a spare spot and that's the harshness of what goes on."