The transgender footballer made headlines two weeks ago after her bid to play in the women's AFL league was denied.
The AFL deemed Mouncey - who had previously represented Australia in men's handball - to have an unfair advantage over the rest of the competition.
Officials said the AFL’s decision was based on the Victorian Equal Opportunity Act, which decrees athletes can be discriminated against based on their gender 'if strength, stamina or physique is relevant'.
'Of course I’m going to have a size advantage over some of the girls,' the 28-year-old said on Channel Nine’s 60 Minutes.
'But I feel the game prides itself on being able to be played by anyone — whether it be little rovers, or your ruckman, or your full forward and forward pocket ... I obviously don’t agree with what the AFL has done. There’s a dozen girls of my height. I was the tallest within a couple of centimetres.'
Mouncey said she didn’t realise her wish to transition until she was in her 20s
'I didn’t realise until I was a lot older,' she said. 'I was seeing a psychologist for different things and that’s how it sort of came out ... it’s not a decision, it’s just not.'
Chris Rourke, Mouncey’s coach at Canberra’s Ainslie Football Club, admitted he had reservations about the towering six-foot-two star when she joined the club.
However, Rourke also said he’d received no complaints from opposition players regarding Mouncey’s size advantage. He then admitted her skill level on the paddock was 'average'.
Despite the storm following her knock-back from the AFLW, Mouncey was given the thumbs-up to play women’s football in Canberra in 2018.