A public interest report by district auditor Ceri Stradling earlier this month recommended disciplinary action to restore public confidence in the council. Police are investigating.
Listing concerns about misconduct and breaches of regulations involving members and officers, Mr Stradling named chief executive Leon Gibson. His report also referred to the regulatory roles of central services director and monitoring officer Iwan Rees and finance director David Elis-Williams.
A council spokesman said in the light of this delicate position the council had decided to ask for independent advice.