AOC President John Coates confirmed to insidethegames earlier this month that a complaint had been made against a member of staff following reports of a dispute between De Jong and Tancred.

De Jong has now claimed a fellow AOC executive had accused her of leaking AOC Board discussions, which she denied and lodged a complaint Coates.

She claimed Tancred then called her demanding the complaint to be withdrawn before issuing a threat.

"He said, 'Fiona, withdraw the complaint or I will bury you'," De Jong told Fairfax Media.

"The nature of his conduct could best be characterised as blackmail and intimidation.

"Over the course of my career I've been exposed to plenty of heated discussions, and poor choice of words or bad language in the workplace, but this went way beyond that.

"It's one thing to take me on, but quite another to involve my family."

De Jong announced her resignation as the AOC chief executive last October having been Australia's Deputy Chef de Mission at Rio 2016. 

She had been with the AOC for 12 years and worked on 10 Olympic campaigns.

It had been claimed she had lost control of communications at the AOC, with Tancred reportedly insisting on reporting to Coates.

De Jong has reportedly claimed that four months after lodging a complaint against Tancred, she has yet to hear any update.

"There's no reason for such a delay," she said.

"It's deeply disappointing when you stand for a matter of integrity and it's swept under the carpet by the very people that are there to uphold it."

Four further allegations have been reported by Fairfax Media, with three unnamed women reportedly having made either informal or formal complaints.

Ryan Wells, who worked for the Australian Olympic Committee between 2000 to 2005, has also alleged he was threatened.

The Briton claimed he was eventually given a negative review by Tancred, leading to him being made redundant by the AOC and having to leave Australia.

"He stood about 60 centimetres from me, stood over me and threatened me: 'I will kill you',” Wells said.

"For me it had very large consequences: I had to leave Australia and the job I love.

"That really makes me angry today, the injustice of that."

The AOC and Mike Tancred have declined to comment when contacted by insidethegames regarding the claims made.

The allegations come in the build-up to the AOC Presidential election on May 6. 

Coates is being challenged for the first time since taking the role since 1990, with Atlanta 1996 Olympic gold medallist Danielle Roche standing against him.

Coates, an International Olympic Committee vice-president, admitted to insidethegames that criticism aimed at Tancred’s intervention into the Presidential race was "fair".

Tancred had alleged the there was a campaign from those against the President to ensure he is replaced and has written a newspaper piece backing Coates to remain.

It followed claims Roche was put up to standing by the Australian Sports Commission (ASC) chairman John Wylie, who has been involved in a public row with Coates in recent months.

Coates accused Wylie of trying to oust him from his position and the pair were involved in a heated exchange during a Nitro Athletics event in Melbourne earlier this year.

Last week, Coates claimed he had told Wylie: "I don't shake hands with liars, I don't shake hands with c****."

Australian Sports Minister Greg Hunt has also rejected suggestions that the Federal Government is taking sides in the Presidential election race after claims Australian Prime Minister Malcolm Turnbull had intervened in reappointing Wylie as ASC chairman before the election.