Charles Oliveira is taking a massive risk at UFC Rio.

On June 28th, the former UFC Lightweight Champion was knocked out unconscious for the first time in his career when he met the powerful Ilia Topuria at UFC 317.

Just five weeks after suffering the devastating KO loss, Oliveira has already booked his return in the main event of UFC Rio against #10 contender and striker Rafael Fiziev on Oct. 11.

Oliveira has a 105-day turnaround, and many fans are concerned about how his chin will hold up against a Muay Thai striker of Fiziev’s caliber.

From personal experience, former two-division champion Daniel Cormier says this isn’t Oliveira’s brightest idea.

• READ MORE: ‘I just wanted to…’ Charles Oliveira shares biggest regret from Ilia Topuria fight at UFC 317

Daniel Cormier wanted Charles Oliveira to take time off following Ilia Topuria KO loss

Cormier shared his thoughts on Oliveira returning sooner rather than later on his YouTube channel.

“Anytime Do Bronxs fights, I get excited, the world gets excited,” Cormier said.

“But then you start to digest the idea that Charles Oliveira last month got knocked out bad. Why so soon?” Cormier continued.

“That was my thought once I calmed down from the excitement of, oh, my goodness, Charles Oliveira is fighting again. For me, that’s scary when you get knocked out like that…

“You should take a little bit of time before you go back into the Octagon,” Cormier suggested.

Cormier added he was in a similar position after his rematch with Jon Jones didn’t go his way at UFC 214.

“I remember in 2017. I fought Jon Jones. I got knocked out in Anaheim. I got a fight offer right after, and I just said, nah, I need to let my brain heal. I’ve got to let my mind settle. After going out like that. It would not have gone well.

This was Cormier’s first knockout loss of his career, one he bounced back from against Volkan Oezdemir six months later at UFC 220.

“I respect Charles Oliveira tremendously. I think he’s amazing. Charles Oliveira fighting in three months after that knockout, to me, just does not seem like the best decision.

“I hope—I don’t have to look back at this three months from now and go, oh, it happened to Charles. But it’s very scary,” Cormier said of Oliveira’s quick turnaround.

Justin Gaethje waited almost a year to fight again after KO loss

Former BMF Champion Justin Gaethje took his recovery very seriously after he suffered a brutal knockout loss to Max Holloway at UFC 300 in April of last year.

Instead of booking another fight like Oliveira, Gaethje did six months of no-contact training to let his brain heal.

Gaethje returned to the Octagon in March when he rematched Rafael Fiziev at UFC 313.

Gaethje’s 11-month layoff seemed to pay off as ‘The Highlight’ got his hand raised by unanimous decision, not taking too much damage.