SIR David Murray's conduct as Rangers owner is being examined by insolvency investigators.

The role played by all board directors of the club in the three years prior to its administration is being looked at by the Insolvency Service's Investigations & Enforcement Directorate.

Rangers legend John Greig plus former chief executive Martin Bain and chairman Alistair Johnston will also come under the microscope.

The conduct of Craig Whyte, who put the club into administration, will be looked at.

Administrators Duff & Phelps are understood to have completed the report.

The Insolvency Service's Investigations & Enforcement Directorate has confirmed it is "considering the matter" but the report is likely to be confidential.

The organisation can take action against directors if their conduct has not been satisfactory and this can lead to the disqualification of directors for periods of up to 15 years.

The Insolvency Service was unable to confirm if it was acting on calls by Mr Johnston to investigate Whyte's takeover.

When Whyte bought the club from Sir David for £1 he also wiped off around £18 million of debts to Lloyds Banking Group.

An Insolvency Service spokeswoman said: "We can confirm that, since Rangers has entered a form of insolvency, an insolvency practitioner (IP) is required to report on the conduct of the directors. The IP has reported and so the Investigations & Enforcement Directorate are considering the matter."