The Football Association has appointed chief operating officer Alex Horne as acting chief executive following the resignation of Ian Watmore.
Watmore stepped down from the position on Monday despite having been in the post for only a year, having grown frustrated that his proposals were being thwarted.
An emergency FA board meeting on Tuesday saw the departure discussed and the appointment of Horne as Watmore's temporary replacement.
An FA statement read: "The board have invited current chief operating officer Alex Horne to take on the role of acting chief executive officer with immediate effect. The board regrets that Ian has decided not to continue as CEO, but has every confidence in Alex, the outstanding staff at The FA and the managerial leadership in place within the organisation.
"It has been agreed that Ian Watmore will leave the organisation at the end of this month. The board also began the steps of planning the process for the future."
Lord Triesman revealed the Football Association would take their time to appoint a new chief executive. The search for Watmore's successor now begins but Triesman, the FA's chairman, insists they will not be rushed into making a decision.
Triesman has ruled out an appointment before the World Cup starts in June and it could conceivably come after FIFA have voted on England's bid to host the 2018 tournament in December.
"On Friday I'll sketch out what I think will be the right timetable and submit that to the board,'' Triesman told Sky Sports News. "There's no desire to spend a huge amount of time on this, we all want to replace the CEO.
"But I want to make sure that when the board is slightly reconfigured, as it is each summer, that it has the chief executive that it wants. It would be very discourteous to a board to not have that opportunity.
"If we appointed a new CEO before the World Cup we'd only do it by failing to advertise and failing to find the right candidates. Time is very short and there is a real preoccupation on our part with winning the World Cup.''