McMann, a former Olympic wrestler and one of the newest female fighters in the UFC, already has a fight lined up against Sheila Gaff, but that didn't stop her from ripping into Rousey's skillset.
McMann explained that Rousey has plenty of weaknesses and that she's definitely beatable.
"I don't view Ronda Rousey as unstoppable because I don't view any fighter as unstoppable, or any athlete in general," McMann said. "Everybody has strengths. Coming with strengths, the natural thing is to have weaknesses in certain areas, myself included."
One of Rousey's sore spots appears to be her willingness to give up her back when she shoots for a judo throw, as UFC contender Liz Carmouche was able to secure a standing neck crank when the star judoka attempted to do so.
Perhaps that will be a weakness that McMann will try to exploit when she does ultimately challenge Rousey.
"I just don't look at anyone in that capacity," McMann said, referring to athletes perceived as unbeatable by fans and the media. "Every great guy fighter that I follow, they have losses on their records. You're not just suddenly 'Oh I started MMA, so I'm suddenly perfect.' We wouldn't want to watch that anyways. We want the highs and lows. We want the wins and the losses. That's what keeps the fans interested, so I don't view it like [Rousey being unstoppable.]
"Ronda Rousey would be a good matchup for me because we've both done sports at a very high level," McMann added. "We've both performed well under pressure, and we have similar backgrounds as far as both of them being the takedown throw and ground art. I think it would be a really good fight."