Conor McGregor has sent his greatest fighting foe, Nate Diaz, a video message claiming that the Stockton native's win against him was pure dumb luck.

Nate was a guest on the Conan O'Brien show last night, and although Conor couldn't make an appearance, he sent his UFC 202 opponent a chilling message from Las Vegas.

The Dubliner said that he would have his revenge on August 20, adding that the last time they fought "the boy won the lotto."