Noel Mooney will take up a role with the Football Association of Ireland for the next six months after a request by the body to UEFA.
It also means Rea Walshe will switch from interim CEO to Chief Operating Officer, likely moving the balance of power to Mooney.
The former Limerick goalkeeper was previously head of marketing for the League of Ireland and takes up a role of "General Manager for Football Services and Partnerships".
He currently holds the position of Head of National Association Business Development with UEFA and had been linked with a possible return to Ireland as a replacement for former FAI chief executive John Delaney.
Mooney will start on 3 June, before returning to UEFA on 30 November.
He will initially assess the FAI’s requirements and will co-ordinate future support and expertise in finance and other areas from UEFA and FIFA.
Walshe will continue to lead the process of governance and reform according to the FAI.
Mooney and Walshe will not be members of the FAI board under this new interim arrangement.
FAI president Donal Conway said: "UEFA’s advice and support will be very important to the FAI as will Noel Mooney’s UEFA experience and knowledge. Noel Mooney will also play a key role in our engagements with all of our stakeholders as we deliver change for Irish football."
Mooney said: "Working with all of our stakeholders, I am confident Irish football will emerge stronger and better over the next few months as we listen to the voices of those who want the game to succeed and are determined to deliver the radical reform required for Irish football.
"In my time with UEFA I have led teams across Europe developing football in many countries. Returning home to help the FAI with its challenges is something I will embrace as we deliver change with our highly committed staff and all our leagues, clubs and partners."