DUSTIN POIRIER and his wife Joile were left 'upset' by Conor McGregor's dig at the integrity of The Good Fight Foundation.
Poirier revealed this week that The Notorious hadn't made good on his promise to donate £363,000 ($500,000) to his foundation.
A furious McGregor hit back at The Diamond by claiming he hadn't received proof of where the funds would go.
Former UFC heavyweight Justin Wren spoke to Poirier about the saga and revealed to TMZ that the former interim lightweight champion's opinion of the promotion's poster boy has drastically changed.
Wren said: "I think he think's it's a cheap shot, it's a low blow.
"Also, I think that this has really changed Dustin's opinion on who Conor is as a person. He’s said he's not a good guy. And that's putting it politely.
"Conor didn’t rob Dustin of anything. What he did was he cheated or stole from the people he would’ve helped.
"Whether that's the pygmy people or the kids in Lafayette, Louisiana. Dustin doesn't take a percentage, he gives that all away.
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"If anything, he's a fund-raising mechanism tool or funnel hat just takes it and puts it towards great causes he and trusts he believes in.
Wren, who runs his own charity called Fight for the Forgotten, reckons McGregor's actions have painted him in a negative light.
He continued: "Dustin is an honorable man, a good character, who’s a family man, who has literally done everything he ever said he was gonna do and more … and the other guy hasn’t followed through on a lot of the things that he has said.
"So, I think that this really calls Conor's character into question even more so than it's already been."
It's unclear if McGregor will end up making good on his donation, which he promised ahead of his UFC 257 rematch with the American.
And Wren has urged the Irishman to be man of his word.
He said: "Look deep into your heart brother and see if this is the right thing to do or not because I don't think it will sit well.
"I think that he needs to take a real look internally – because is this just an excuse?
"Because it sounds like one, it is one. Or he's being delusional in the fact that Dustin's not doing the right stuff with the money.
"Have your team look into it or you look into it, Conor.
"Don't just have an excuse when you didn't reach out to Dustin or Jolie, his wife, who is an incredible person or their foundation.
"Give them the opportunity to show you you're going to do the right thing with the funds.
"Or just fight him a third time and whenever you fight him a third time, Dustin's probably going to raise more than he ever has and he doesn't need the donation from you."
Poirier and McGregor, both 32, will renew their rivalry on July 10 in the main event of UFC 264 in Las Vegas.
And the pair's blockbuster trilogy fight will take place in front of a sold-out crowd at Sin City's T-Mobile Arena.
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