Anthony "Rumble" Johnson announced his retirement following defeat to UFC light heavyweight champion Daniel Cormier on Saturday, but a switch to the NFL is not on the cards.
Johnson lost by submission in the second round against Cormier at UFC 210, and the 33-year-old confirmed in the immediate aftermath he would not be returning to the octagon.
"This is my last fight. I didn't even tell [UFC president] Dana White," Johnson said.
"My coaches knew. My family knew. My friends knew. I have to thank you all for being there for me. I gave my commitment to something I've wanted to do for a while. It's not MMA-related. It's just time to move on.
"I'm tired of getting punched by other guys. There's nothing fun about that. I enjoyed it, though. I enjoyed the UFC."
Johnson won 12 of his final 14 fights over the last five years, with his only two losses coming to Cormier in title bouts. He will finish his career with a 22-6 record that includes 16 knockout victories.
While Johnson did not outline any details regarding what his future holds, he denied rumours suggesting he was going to play for the Los Angeles Rams.
He told a post-fight press conference: "It's just business, you know. I want to do something besides going to the gym every day, punching and kicking and rolling around with another dude - s*** gets old. It's time to move on.
"And no, I'm not about to play football for the Rams, because everyone's hitting me up and saying some crazy stuff.
"Why would I go into another sport that is the same thing as this and you take all this impact and stuff?"