UFC commentator Joe Rogan says Rafael Dos Anjos may prove a step too far for Conor McGregor.

The Dubliner fights the Brazilian for the lightweight belt on March 5th in Las Vegas, with McGregor stepping up in weight from the UFC featherweight class where he is already champion.

But Rogan believes Dos Anjos may be too strong for him.

"He was knocking motherf**kers dead at 155 with one punch, all throughout England. I don’t know if he could do that [at 155]. I just don’t know if he is going to be able to do it. Here’s a thing about dos Anjos, he is a gap closer. That motherf**ker closes gaps on you before you even realise he is on top of you," he said.

"He did it to Donald and he did it to Pettis, two guys who are pretty skilful strikers. He closes that distance on you in a surprising way and his grappling is outstanding. And there is no hesitation in his game. And with that Nick Curson dude training him, he's got 15 gas tanks. They're all ready to go."