The Australian Cabinet is expected to consider theahead of a review of the Labor government's broadband plans.
NBN Co chairwoman Siobhan McKenna and all but one of her board colleagues have offered their resignations to new Communications Minister Malcolm Turnbull.
It is understood that the resignations will be considered at a meeting of the federal cabinet as early as next Tuesday.
The NBN Co website makes no mention of the resignations, but states: "This website is currently under review, pending the introduction of new government policy."
An experienced media and telecommunications adviser, McKenna has only been in the chair since March.
A spokesman for NBN Co told AAP on Monday: "We have no comment."
The Abbott government has flagged at least three examinations into broadband: An independent audit of NBN Co's books, a review of its commercial progress, and a Productivity Commission inquiry into broadband policy.
The Liberal-National government wants to cut down the cost and speed up the rollout of a National Broadband Network by changing from a fibre-to-the-premises model to a fibre-to-the-node version.
The Coalition has blamed the board and executive team for massive cost blowouts, timetable delays, and contractors losing money.
But Labor leadership candidate Bill Shorten said that the Coalition has undermined the NBN Co board to date, and would seek to replace the board with a group made up of friends of the Coalition.
NBN Co chief executive Mike Quigley, who sits on the board,, but remains in the job during the transition.
Former Telstra boss Ziggy Switkowski had previously been flagged as.
Liberal frontbencher Mitch Fifield said the government would ensure there is "good and appropriate governance" of the NBN.
Fifield said the Abbott government supports the NBN.
"All political parties are for a National Broadband Network — that is not what is in debate here," he said.
"What we are going to do which is different is roll out the NBN faster, but we are not going to mandate that every single house has to have the same connection at the same speed.
"We will provide for fast speeds, speeds that are adequate for people's needs."
Josh Taylor contributed to this article.