Baroness Harman, former deputy leader of the Labour Party, has proposed that men be barred from contesting the party's next leadership election.
Her aim is to guarantee that a woman secures the top position.
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Her comments come after Andy Burnham took over as leader unopposed, following Sir Keir Starmer's resignation as Prime Minister and Labour leader.
Lady Harman pointed out that Labour has never elected a permanent female leader, while the Conservative Party has had four.
She noted that both Baroness Beckett and she herself held interim leadership roles, but women continue to be sidelined.
Speaking on Sky's Electoral Dysfunction podcast, she outlined her plan to change the party's dynamics.
"I've worked out that the only way we'll have a woman leader of the Labour Party next time is if we start a conversation now where we say that, actually, men cannot stand for the leadership next time," she said.
She intends to engage with up-and-coming male colleagues to rethink their ambitions.
"Are you going to support a woman next time or are you going to put yourself in front and put a woman behind you?"
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she asked.
She also highlighted the structural disadvantage women face in open contests.
"For every man who stands for leader and gets to be a leader, he has pushed a woman...
into second place behind him," she explained.
Lady Harman had originally advocated for a female candidate after Sir Keir's resignation.
Following his unopposed election, Mr. Burnham promised to reform the internal culture regarding women, addressing past allegations of a misogynistic atmosphere in government offices.
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The newly formed administration features equal gender representation, marking the first time in British history that women comprise half of the Cabinet, including Home Secretary Shabana Mahmood and Chancellor of the Duchy of Lancaster Louise Haigh.