UFC lightweight champion Conor McGregor holds a media workout in Las Vegas, ahead of his fight against Floyd Mayweather Jr. on August 26/ AFP/File /

Irish mixed martial arts star Conor McGregor has boasted that he will knock out Floyd Mayweather inside two rounds when both fighters clash next week.

McGregor told reporters on a conference call on Wednesday that a controversial switch to lighter gloves could lead to an explosive outcome in the August 26 showdown in Las Vegas.

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McGregor, who is widely seen as a massive underdog against undefeated former welterweight king Mayweather, predicted an early finish to the fight.

“Particularly with the eight-ounce gloves, I don’t believe he makes it out of the second round,” said McGregor, nevertheless expressing the hope that the fight would last longer.

“I don’t want people saying ‘Oh, it was a lucky punch’ and all that. Part of me is hoping maybe he can last so I can show some skill and dismantle him that way.

“But I do not see him absorbing the blows in the first few rounds.”

‘Hell and back’

The 29-year-old said a grueling training camp has taken him to “hell and back” and left him ready to face any kind of scenario inside the ring at the T-Mobile Arena.

Ultimate Fighting Championship President Dana White also believes the gloves switch could shape the outcome of the fight.