Ali, 37, recently told told TMZ Sports that despite her advanced age, no lady could beat her in a fight, especially the under sized Rousey.
"No woman can beat me, period," Ali stated. "She's too much smaller than me anyway. She's like the size of my daughter, my 3-year-old."
Ali hasn't fought in over eight years. She retired with a perfect 24-0 professional record.
Rousey heard about Ali's comments and said that her size means nothing when fighting her, and if Ali wants to find out first-hand, "Rowdy" ain't hard to find.
"If she wants to take me up on that, I'm around," Rousey told TheDailyBeast.com of Ali.
"She's retired and has several kids. I understand why she'd think that because she has a size advantage, but if you saw my last fight it had nothing to do with size or strength at all.
"That's not how I beat people. So you can't count having a size and strength advantage as having a real advantage against me."
Rousey has hardly been challenged in her career and is unbeaten after 11 fights.