The Football Association of Ireland has appointed Sarah O'Shea as deputy to chief executive John Delaney.
O'Shea, who joined the FAI in 2006, will combine her new duties with her role as the organisation's director of legal affairs.
Delaney said: "Since Sarah's appointment in 2006 she has made a substantial contribution to the management team.
"She has been an excellent legal director, establishing the legal department and reforming the Association's disciplinary processes.
"As the governance and administrative needs of the game change, the FAI continues to adapt its structures and Sarah's appointment is part of that process."
O'Shea, a panel member at the Court of Arbitration for Sport, said: "We are embarking on another important phase for Irish football.
"I am keen to play a valuable role, particularly in the administrative and organisational aspects of the Association as deputy to the CEO."