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."

Of course, McGregor found some time to throw in some verbal sparring, telling his opponent that he should stop wearing the same black t-shirt because "he's been wearing the same one for 20 years".

Watch Conor McGregor's message to Nate Diaz below.