The inquiry will start on September 21 as part of an ICAC investigation into allegations concerning Mr Maguire that the commission referred to as Operation Keppel.

"The commission is investigating allegations that, from 2012 to August 2018, Mr Maguire engaged in conduct that involved a breach of public trust by using his public office, involving his duties as a member of the NSW Parliament, and the use of parliamentary resources, to improperly gain a benefit for himself and/or entities close to him," a statement from ICAC said.

"These entities included G8way International/G8way International Pty Ltd and associated persons."

The Daily Advertiser has contacted Mr Maguire for comment, but did not receive a response before publication.

Mr Maguire resigned from Parliament in August 2018 in response to weeks of pressure after ICAC heard, in a separate inquiry, tapes of intercepted phone calls containing his conversations about a Sydney property deal.

The previous ICAC inquiry, referred to as Operation Dasha, did not target Mr Maguire directly as it was investigating allegations against Canterbury councillors.

READ MORE: How a former Wagga MP's career came crashing down at ICAC

Mr Maguire was recorded in a discussion with then Canterbury councillor Michael Hawatt about finding housing projects for property developer Charbel Demian to purchase.

Mr Demian has denied ever having discussions about paying sales commissions to either Mr Maguire or Mr Hawatt.

ICAC stated that the commission expected the new inquiry into Mr Maguire will hear from multiple witnesses and run for four weeks.

ICAC's Canterbury City Council investigation in still ongoing.

ICAC stated that the commission expected the new inquiry into Mr Maguire will run for four weeks.

IN OTHER NEWS:

"Due to a potential conflict of interest, the commission has determined that it is appropriate for an Assistant Commissioner to preside at this inquiry," an ICAC statement said.

Ruth McColl has been appointed Assistant Commissioner for the inquiry.

Mr Maguire's resignation triggered a September byelection that, combined with the departure of Prime Minister Malcolm Turnbull due to a leadership spill, saw the Liberals lose the Wagga electorate to independent Dr Joe McGirr.

MORE TO COME