"I think I should stay retired," he said. "One thing I know is that I put a lot of effort, a lot of energy into this camp. I trained for the last year to do this camp, to do this fight. After the last few fights, I'm kind of getting tired (of training)."
Penn returned earlier this year, moving down to featherweight for the first time in his career. He suffered a third loss to Frankie Edgar, the same fighter who took the lightweight title from him in 2010. The Hawaiian will turn 36 in December.
- UFC female bantamweight champion Ronda Rousey isn't just blowing smoke when she says Gina Carano would be her biggest challenge. Despite not fighting for several years, Rousey feels Carano can step in and give her a run for her money.
"I really do believe that she's the hardest competitor I could ever find to fight," said Rousey, during a recent interview with ESPN. "Even if you don't believe that, even if you think she took too much time off and it'd be a quick fight, to be honest, that fight would be too hot not to watch. It doesn't really matter if it'll be competitive or not. And if you do what it, you're going to be surprised: It'll be one of the greatest fights to ever happen in the history of women's MMA."
Rousey (10-0) has stated a desire to fight on the year-end card, as she did last year. Carano (7-1) remains unsigned, but UFC president Dana White has reached out numerous times to her representatives.
- Despite possibly facing a lengthy suspension for his decision to not take a drug test earlier this year, Wanderlei Silva remains hopeful for a fight to be made. And he has his sights set on Dan Henderson.
Henderson, looking to get back in the Octagon later this year, responded via Twitter to the fight proposal by "The Axe Murderer." Henderson and Silva have squared off twice, with the Brazilian winning the first via decision in 2000 and the American avenging the loss in 2007 via third round knockout.
Got a news tip or correction? Send it to us by clicking here.
UFC Championship Contender Fails Drug Test, Suspended For A Year; UFC And Fighter Comment
MVP Reveals TNA Contract Status
Today In Wrestling History 7/6: Goldberg Wins WCW Title, Canadian Stampede, McMahon Trial Day 2
Steve Austin On Why He's A Big Fan Of Finn Balor, Thoughts On Seth Rollins, The WWE 2K16 Cover
Roddy Piper Says Steve Austin May Have Caused His Podcast To Be Dropped By Podcast One
Ring Of Honor TV Results (7/6): Jay Lethal Decides Fate Of Championship Titles, Big Six-Man Tag
Reporter Attends WWE Tough Enough Camp, David Otunga On His Return, RAW Pre-show, WWE 2K16
WWE "The Beast In The East" Results - Brock Lesnar Returns To Action, NXT Title Match, More
Brock Lesnar Update For Monday's RAW, Chris Jericho On His Match With Neville, WWE - Sumo Hall
Chyna Talks About The Last Time She Saw Triple H, What Happened During Her Trip To WWE Headquarters
Randy Orton Gets Engaged, Brock Lesnar's Most Unusual Opponents, Total Divas Preview
Vince Russo Recalls Original Plans For Chris Jericho's WWF Debut