The life-long United fan stepped down from his current position this morning. Neither Child or the club are making any official comment on the developments.
Child arrived at the club on December 12 from the telecommunications industry, having held senior positions in private equity backed companies.
“I have been involved for a few months behind the scenes and have been hugely impressed by the president’s passion, commitment and will to win.
“We find ourselves in interesting times, but as a Leeds fan I know only too well that we are often at our best when we have adversity.”
Speaking after the appointment of Child, Cellino said: “I am delighted to announce the appointment of Matt Child as our new Chief Operating Officer.
“Matt will take immediate responsibility for the management and development of the day to day business.
“It is vitally important that we protect and enhance the future of the club and develop the most effective ‘off field’ team that we can.”