McGregor, who was beaten by Khabib Nurmagomedov at UFC 229 last week, was at Dallas Cowboys’ NFL Week 6 clash with Jacksonville Jaguars.
The hosts convincingly beat the Jags 40-7 on home soil with running back Ezekiel Elliott and receiver Cole Beasley shining.
McGregor, who has been provisionally suspended from UFC, decided to try his hand at NFL during the game.
The quarterback is the most prized position in the sport and McGregor wanted to see how he would fare.
Many will say not well with the Irishman’s throwing style unique to be kind.
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One fan on twitter suggested: “Might need some more whiskey to cure that throw or whatever that was.”
Another said: “@TheNotoriousMMA can throw a jab with that left but throwing a football is a different story.”
Conor McGregor made his attendance felt, meeting the Cowboys stars before the game as well as owner Jerry Jones.
While McGregor’s throwing style left a lot to be desired, he may be more successful in a career as a receiver, taking a neat catch.
Elliott was inspired by the Notorious’ appearance, celebrating his touchdown by doing McGregor’s famous strut.
The former UFC champion showed his appreciation on social media by retweeting clips of Elliott’s celebration.
McGregor is still recovering from last week’s UFC loss which was shrouded in controversy.
Khabib beat McGregor fair and square before vaulting the Octagon to attack a member of the Irishman’s team.
McGregor was then attacked by Khabib’s team with the two fighters set to be suspended for at least 10 days by the Nevada State Athletic Commission.
Khabib’s purse has been withheld by the commission pending the outcome of an investigation.