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McGregor based himself in LA prior to flying out to Las Vegas to fight Poirier at UFC 264.
The 'Notorious' came up short in the rubber match, losing a doctor's stoppage after snapping his leg in the first round of their lightweight showdown.
The 33-year-old has since claimed he suffered an injury in the build up and nearly pulled out.
But UFC lightweight contender Gaethje has another theory as to why McGregor broke his leg.
He reckons the Irishman 'drinking too much soya milk' caused the gruesome injury.
'The Highlight' told ESPN's Brett Okamoto: "My take would be that he is hanging around LA drinking too much soya milk.
"And there was clearly no obvious check that should have caused a break (leg) like that.
"It's got to just be a freak occurrence, or the guy has weak bones but I can't explain it and none of us can."
Gaethje had been linked with a fight against McGregor, but an Octagon meeting never materialised.
The former interim UFC lightweight champion believes that boat has sailed and reckons McGregor will opt for big-name, money fights before calling it a day.
He added: "After he choose Cowboy [Donald Cerrone] and it went down in history that I had an opportunity to fight him between Tony [Ferguson] and Khabib [Nurmagomedov], but I never received an official offer.
"In my mind, the ultimate goal was to beat Khabib and then Conor and that was worth the risk, so that was what I chose.
"But [fighting McGregor] could have been a possibility then, maybe. But I think the chances are [now] zero per cent.
"Because I think he'll fight, if once or twice [more], and it won't be guys like me.
"It'll be guys like Nate Diaz, Jorge Masvidal, you know, favourable match-ups."
Gaethje, 32, hasn't fought since his championship defeat to Nurmagomedov.
But he's set to return to action on November 6 when he faces Michael Chandler in a standout bout at UFC 268.
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