Matt Brown: CM Punk is going to be in for a 'big shock'

When the UFC announced the signing of WWE superstar CM Punk to a multi-fight contract, an army of fighters came out against the promotion's decision to ink a pro grappler with no MMA experience.

Among Punk's detractors was rugged welterweight Matt Brown, who expressed his disbelief in the professional wrestler's decision to make the transition to "real" combat sports.

"The Immortal" isn't backing away from his initial opinion, saying recently that Punk might be in for a rude awakening the first time he steps foot inside the Octagon.

"At least Brock Lesnar, he at least knew what he had in store, what it felt like to get in there," Brown told The MMA Hour, according to MMAFighting.com's Luke Thomas. "The thing that I was getting at when I was talking about CM Punk was, I think he's going to be in for a big shock. When you step in that UFC cage, when they say it's as real as it gets, that's the truth. When you walk in there, those lights shining on you, everybody looking at you and there's a dude across the cage that wants to rip your head off, it's a different feeling than anything he's ever felt before.

"He's going to have some really deep, dark thoughts. We call it the Worm of Doubt. He's going to have lots of worms in his head causing doubt."

While no one knows exactly when Punk will make his UFC debut, Brown faces one of the biggest tests of his career at UFC 185 in March, when he's scheduled to tangle with former 170-pound kingpin Johny Hendricks.