On Friday, UFC President Dana White said heavyweight prospect Francis Ngannou has the potential to become UFC champion.

Ngannou will fight in the biggest fight of his career on Saturday when he fights Andrei “The Pitbull” Arlovski at a UFC on FOX event in Denver, Colorado.

“‘The Pitbull’ has been around a long time,” White said. “Obviously, Arlovski is a legend in this sport, a legend in the heavyweight division. Francis Ngannou will be. I believe that this guy has the potential to become the heavyweight champion of the world. I also believe he has the potential to hold that title for a very long time.”

Ngannou is on an eight-fight win streak. His last four victories have all come inside the UFC. He has nine total MMA wins, with five by knockout and four by submission.

“I don’t know if in the history of the UFC we’ve ever had a heavyweight champion like Ngannou who actually looks like that,” White said. “Put him side to side with NFL players. Put him side by side with the heavyweight boxing champions throughout history. This is a massive, massive guy.”

Arlovski is currently on a three-fight losing streak in the UFC. He is coming off losses in 2016 to Josh Barnett, Alistair Overeem, and current UFC Heavyweight Champion Stipe Miocic.

Saturday’s UFC on FOX event will take place at the Pepsi Center in Denver. Valentina Shevchenko will fight Julianna Pena in the main event. Donald “Cowboy” Cerrone will fight Jorge Masvidal in the co-main event.