McMann went down 66 seconds into the fight during the women's bantamweight title bout at Mandalay Bay Events Center in Las Vegas.
Rousey knocked out McMann with a knee to the liver after a series of knees and elbows to the body.
"We studied her videos and knew it was the best thing to concentrate on the liver shot for this camp," Rousey said. "The knee has been working for me the most throughout sparring in this camp."
"Of course I'm interested in it," Rousey said of a potential fight against Cyborg after she knocked out McMann. "I'm not going anywhere. She knows where I'm at."