Former three division champion Shane Mosley, who retired earlier this week, believes UFC star Conor McGregor will be shocked by the punching power of Floyd Mayweather.

Mayweather may be the best defensive fighter boxing has ever seen, but he plans to going on the offensive against McGregor in their Aug. 26 fight at T-Mobile Arena in Las Vegas.

Now that both fighters were given permission to use 8-ounce gloves, McGregor believes that he will knock Mayweather out even quicker.

And he doesn't fear any of the punches that Mayweather will release with the new glove size. Mayweather has not had a clear knockout victory in a decade - since he knocked out Ricky Hatton in the fall of 2007.

“I will go in and dismantle him at his own game. That’s what a true martial artist can do, they can adapt under any circumstance. Bruce Lee said, ‘be like water,’ and when the water enters a cup, it becomes the cup. That’s the philosophy I’m going into this contest. It doesn’t matter what rule set or stipulations they try and put on me, I can adapt and overcome any situation. And that’s what I will do on Aug. 26. I’m feeling very confident I can walk through any shot and break him down,” McGregor said.

Mosley believes McGregor will be in for a big surprise once Mayweather tags him.

Mosley was the last fighter to Mayweather in serious trouble, when the boxers collided in 2010. Mosley had Mayweather badly hurt in the second round, but he was unable to finish him, and then Mayweather dominated the remaining ten rounds.

"Strategically, I see Mayweather having a great time. I see him laughing and smiling while McGregor is trying to hit him and find him. I see McGregor noticing how hard Mayweather hits, because he doesn't think that he hits that hard.  I think he will notice how hard Mayweather hits and when he gets hit by Mayweather he will notice that it's different from UFC punches," Mosley told Undefeated on Fox Sports.

"There is a misconception about the gloves. The gloves are only meant to protect the fighter's hands, not protect the fighter's jaw. Back in the day, when fighters would fight bare knuckle, they would hurt their hands and break their hands. They had to find a way to keep the fighters fighting. They started with hand wraps first, then went to gloves."