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The 32-year-old Irishman teased United fans with the idea of buying the Premier League club last month amid backlash over the controversial European Super League.
McGregor took to social media on Sunday for a Q&A session and was asked by one Twitter user if he was serious about his comments to buy the Red Devils.
Responding to the question, the Notorious made a bombshell claim that a "conversation came up" over the possibility of acquiring shares in Celtic from majority shareholder Dermot Desmond.
McGregor added that investing in United was still something that he was interested in doing, saying he is "certainly interested in acquiring a sports team at some stage."
The future UFC Hall of Famer tweeted: "A conversation came up regarding Celtic first to be honest. To acquire shares from Dermot Desmond.
"I am certainly interested in acquiring a sports team at some stage!
"Both Celtic and Man United are teams I like for sure, but I am open. I feel I could do big things for a club."
McGregor previously said that "Manchester United was my team" as he reminisced about spending his First Communion money at eight years old to buy a Red Devils shirt.
Speaking to FIFA in 2019, the Irish superstar admitted: "I was more a player than a watcher back then, but Manchester United was my team.
"It was only the other day I came across an old picture of myself wearing that infamous grey United jersey, which I bought with my Communion money at eight years of age.
"I see my son when I look at that photo. I'd love to know where it is now. A truly 'Notorious' football jersey!"
McGregor has been out of the octagon since his shock second-round TKO defeat to MMA rival Dustin Poirier at UFC 257 in January.
Featured Image Credit: PA/Instagram
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