"B.J. is coming in January to know the gym and help us," Aldo told "He is going to the U.S. again, and then he’ll come back to train with us all for the rest of our camps."

Penn, a jiu-jitsu black belt under Nova Uniao’s Andre Pederneiras, hasn’t trained with Aldo before.

"I never trained with him," he said. "He was already a black belt when I was on the team, so I never had the chance to train with him. But I’ll have this honor now."

Aldo returns to the Octagon on Feb. 1 to face off against Ricardo Lamas at UFC 169. Still considering a move to the lightweight division, Aldo believes that training with the former champion will help him.

"He has fought and became champion in the lightweight division, and at 170, so he has a lot to teach me," he said. "He has a lot of experience in the UFC, he’s been fighting there for years, so his experience and technique will teach me a lot. He has excellent boxing and jiu-jitsu as well."