Nate Diaz and Dustin Poirier have teamed up on social media to troll Conor McGregor after the Irishman responded to Diaz "fragile" claim.
McGregor has not fought since breaking his leg in a second consecutive defeat by Poirier last year and is planning a UFC comeback in summer.
Diaz and Poirier had both ruled out a further meeting with McGregor with the latter having now completed a trilogy with the Irish star.
However Diaz has now claimed he would be open to meeting his rival again by tweeting: "Conor’s going to have to get him some wins and prove he’s not so fragile first."
McGregor later responded with an attached video of him dropping Diaz during their rematch: "Nate Diaz shake them titties on the drop. Bounce them titties."
Poirier chimed in on the social media feud, quickly firing back with a video of him stopping McGregor who replied: "You blew it you bum".
Porier responded: "'It' meaning your fighting career" to which McGregor cryptically replied: "Shopping mall meet and greet".
McGregor fought Diaz twice in 2016, first being defeated by the American who scored a second-round submission, before avenging his defeat later that year by outpointing his rival.
He has also shared a long-term rivalry with Poirier, having stopped his rival in 2014 en-route to winning the featherweight title.
But McGregor suffered back-to-back defeats by Poirier last year to leave question marks over his future.
Poirier has ruled out a fourth meeting with McGregor but admitted he would be willing to enter the boxing ring with his rival if the opportunity arose.
Poirier and Diaz have verbally agreed to their own fight but the UFC has yet to make it official.
And UFC president Dana White has said he would be "shocked" if McGregor and Diaz did not meet for a third time before the end of their careers.
Should Conor McGregor face Dustin Poirier or Nate Diaz again before his career ends? Let us know in the comments section below
McGregor's coach John Kavanagh believes a trilogy with Diaz would be a realistic option for his return particularly he views him as having "one or two" fights left.
"That would be a way to end it wouldn't it. I think Conor only has one or two left as well," he said.
"The Nate trilogy I just think those two guys are like Batman and the Joker, they're going to face each other forever. It's almost unimportant who wins.
"They are just perfectly made opponents. It's great fun to build up, they both snipe at each other a lot but there's a bit of the tip of the hat as well.
"They're both warriors and both great fighters, it would be lovely to see that trilogy."
