In a major UFC shakeup, Charles Oliveira has been handed a dangerous dark horse opponent for UFC Rio in October. Rafael Fiziev has withdrawn, and No. 7-ranked lightweight Mateusz Gamrot steps in.

UFC officially announced the news on Tuesday. Their lightweight main event concludes on October 11, where Oliveira will put his No. 3 lightweight ranking on the line, while Gamrot arguably fights for title contention.

“Mateusz Gamrot, that’s the guy we’re going to war with,” Oliveira announced in a video posted to UFC Brasil. “The rest [of the fighters] just wanted hype, they just wanted to talk nonsense.”