Scottish Rugby have have named Fred McLeod as interim Chief Executive in addition to the post of interim Chairman.
The appointment has been made with the full approval of the General Committee.
In addition Scottish Rugby's executive directors have supported the appointment and will work with McLeod as an interim management team.
Fraser Livingston, Andrew Flanagan and Eric Hagman all stepped down from their positions on the board in the wake of the `no confidence' vote which saw SRU chairman David Mackay resign on Monday.
The influential Premier Forum have already warned the SRU that a breakaway by club teams could follow the current turmoil at the top of the game. But, while SRU president Gordon Dixon admitted the resignations were regrettable, the governing body remain ``committed'' to their way forward for the game.
Dixon said: ``We regret the fact that Fraser Livingston, Andrew Flanagan and Eric Hagman have chosen to resign. We acknowledge their significant contribution to Scottish Rugby over the years and are grateful to them.
``We understand that the change of direction that the general committee proposes was unacceptable to them, but we remain committed to that task.''
The turmoil among the SRU hierarchy has raised the possibility of a breakaway from the game's governing body in Scotland. Premier Forum secretary Kenny Hamilton said: ``We need to keep the sport integrated but, because of the way the game is being managed by the governing body, it may have to be considered.
``I have not met any club or individual who thought removing David Mackay was appropriate.''
A row has been simmering for months between Scotland's clubs and the SRU executive, with club sides fearing a loss of policy-making power to the governing body. But the three outgoing executive board members lashed out at the decision to force Mackay's exit in their notice to quit.
A statement from Livingston, Flanagan and Hagman said: ``Replacing the chairman without prior notice or any consultation whatsoever with the executive board flies in the face of good governance.
``In David Mackay's short term in charge of the board, enormous strides have been made in improving efficiency, planning debt reduction and developing a cohesive and comprehensive strategy for the game. Sadly, the general committee's actions do nothing to further the interests of taking Scottish rugby into the 21st century.''