The firm which acted as administrators of Rangers last year has been cleared of a conflict of interest.
The Insolvency Practitioners’ Association launched a probe following complaints Duff and Phelps should not have taken the role when the club went into administration in February 2012.
The complaints were lodged because Duff and Phelps’ partner David Grier had occupied an advisory role in Craig Whyte’s May 2011 takeover of Rangers.
The probe was launched one year ago and the firm was absolved of wrongdoing over the issue.
A statement read: “The Investigation Committee, made up of independent practitioners and lay members, has, over the past 13 months, carried out a thorough investigation of the administration of Rangers Football Club and the actions of the joint administrators in agreeing to accept the appointment.
“It has concluded that the practitioners complied with the relevant guidance and legislation.”
Duff and Phelps said last year that the probe was launched following a request from the BBC, following evidence revealed in a documentary that Grier was aware of a potential deal between Whyte and Ticketus ahead of the takeover.
Rangers were consigned to liquidation in June last year when Her Majesty’s Revenue and Customs rejected an offer to creditors.
Duff and Phelps agreed a deal to sell the club’s business and assets to a consortium fronted by Charles Green, who quit as Ibrox chief executive last month amid claims from Whyte that he was behind the firm set up to purchase the assets.