Nate Diaz was far from impressed with Conor McGregor's comeback win over Donald Cerrone on Saturday night.
The 31-year-old Irishman brushed aside 'Cowboy' in just 40 seconds at T-Mobile Arena in a devastating return to the octagon.
McGregor hadn't fought in the octagon in 15 months but wasted no time in reminding the MMA universe of what he can do.
But a former rival of his Diaz didn't seem to enjoy what he was watching in Las Vegas.
Diaz posted three cryptic tweets in the moments after McGregor's win and claimed it was "all fake".
Weak as fuck- Nathan Diaz (@NateDiaz209) January 19, 2020
And why the fuck u in a robe- Nathan Diaz (@NateDiaz209) January 19, 2020
This shits alll fake- Nathan Diaz (@NateDiaz209) January 19, 2020
McGregor and Diaz fought twice in 2016 and could be on collision course for a trilogy bout.
Diaz won the first contest at UFC 196 in March 2016 before McGregor exacted revenge in August at UFC 202.
McGregor's victory on Saturday night catapulted him back into contention in the UFC as he lines up a big 2020 in the octagon.
Jorge Masvidal, who beat Diaz last November for the 'BMF' title, could also be on McGregor's radar later this year.
After his win, McGregor said: "I'm the first fighter in UFC history to secure a knockout victory at featherweight, lightweight and welterweight. I'm very, very happy. I'm very proud.
"I'm so happy. Who's going up and down divisions and knocking people out like that? I've etched my name in history once again.
"I like this weight division, I feel really good. I don't believe I'm there yet, though, I've still got some work to do to get back to where I was."