Ronda Rousey (12-0 MMA, 6-0 UFC) only has a handful of years left in the sport, she said. But as long as she continues to compete, the UFC champion said her career is “unfinished” until a matchup with Cristiane Justino (14-1) comes to fruition.

Rousey’s already glistening stardom reached new heights following her 34-second knockout of Bethe Correia at UFC 190 earlier this month. The victory marked her sixth consecutive title defense and was followed by her debut in a Carl’s Jr. commercial and an announcement on “Good Morning America” that she would fight Holly Holm at UFC 193.

The lone women’s bantamweight champion in UFC history has already crossed over into Hollywood with appearances in feature films such as The Expendables 3, Furious 7 and Entourage: The Movie. She’s said several times in the past that her goal is to retire from MMA competition with an undefeated record then move on to the next chapter in her life, which is likely to include more roles on the silver screen.

One thing that continues to linger over Rousey’s combat sports career, however, is the highly anticipated showdown with “Cyborg.” The pair has traded verbal blows over the years, but numerous obstacles have prevented the matchup.

Rousey today appeared as a guest on “The Joe Rogan Experience” podcast with UFC commentator Joe Rogan and revealed that she doesn’t know exactly when her fighting career will reach its end, but said the bout with Justino must happen to give complete piece of mind about her accomplishments.

“It just seems unfinished – my career, there’s more left to do – I don’t feel like I’m done yet,” Rousey said. “With the Olympics it just like, you win an Olympic gold medal and you’re done. With the UFC, when am I really done? I’m not. It feels unfinished still. (The ‘Cyborg’ fight) definitely would (help).”

Rousey, 28, said she has no intention of fighting into her mid-30s. She said she hasn’t yet formulated a specific exit strategy, but she has a general timeframe in mind to hang up her gloves for good.

“I’m not going to be doing this in my 30s; I don’t want to be fighting in my 30s,” Rousey said. “By 30s, I mean like 31, 32. If you’re actually 30 years old that’s 30, not 30s. Once you add the one, that’s 30s, plural. I’m 28. I don’t know. I look at it exactly like how we were talking about fighting, that’s how I do everything else. I don’t look at these separate disjointed things. I’m not going to go in there and try this thing and try this thing and try that thing and hope something works out.”

Rousey’s optimism about spending several more years in the sport keeps the door open for Justino. However, the key sticking pointing in creating the contest surrounds fight weight. Rousey is the UFC’s 135-pound champion while Justino rules as champion of Invicta FC’s 145-pound division. Both Rousey and UFC President Dana White have said the fight will only happen if Justino moves down a weight class.

“Rowdy” has said that her hard-headedness in regards to weight stems from Justino’s failed 2011 drug test where she tested positive for the anabolic steroid stanozolol. Rousey said that “cheaters” deserve no leniency and believes Justino should be able to make 135 pounds.

“The thing is, someone who uses steroids and those kind of things, they need that to mentally think they have an advantage they didn’t earn,” Rousey said. “It’s a crutch for her. She needs to feel like she somehow has an advantage from the outside. She doesn’t think she’s good enough with what she has. That’s why you dope in the first place because you feel like the best you have isn’t good enough. She feels like if we fight fair, what she has isn’t good enough. That’s why she wants it to be somehow stacked in her favor.

“If you can make weight and be on steroids, even if it’s making weight or a relatedly making weight-friendly steroid, you’re still, without it you’re capable of moving down. You see what happens to people without it when they get off of steroids? You see what they look like. It’s very easy for them to drop down. They immediately shrink up. It changes everything. It’s all an insecurity thing.”

Rousey said she has no proof that Justino is currently abusing performance-enhancing drugs. However, she explained why she’s still suspicious of her rival.

“When you look at these people from before they were using and after, they look entirely different,” Rousey said. “‘Cyborg’ looks in ways exactly the same. If she gets off it will be very easy for her to make weight (because of) what we’ve seen from every other person that’s got off it. I think that – I can’t say with proof or anything, but if you look the exact same as you did when you were using, then what changed?”

Although Rousey has a fight set against Holm at UFC 193 on Nov. 14 and contenders such as Miesha Tate and Amanda Nunes are circling a title shot, the matchup with Justino continues to be the greatest desire of fight fans.

Rousey is aware of that desire and said an aspect of her decision to retire from fighting is based on when a fight with Justino will become a reality.

“If she never steps up, I’ll know (why),” Rousey said. “I’ll probably go a little longer waiting for her, but you know, if she showed up sooner rather than later, I don’t know how much longer I would go after that.”

For more on UFC 193, check out the UFC Rumors section of the site.