Conor McGregor's pub was targeted by two petrol bombs just hours after the UFC star had left the venue.
Police are now investigating an incident of "attempted criminal damage".
McGregor, 33, owns the Black Forge Inn on Drimnagh Road in Crumlin, Dublin, after purchasing it for £2million in 2019.
The premises was then attacked, allegedly by two men on scooters, with police probing claims that pipe bombs were left at the scene.
Gardai have appealed for witnesses to come forward and for anyone with dashcam footage to make it available to them but said there was no damage to the venue, which was closed.
Sources close to the scene on Wednesday night told Dublin Live: "There was two people allegedly spotted on scooters who passed the establishment at the time and next thing they were being chased by two others who had come out of the property.
"McGregor had been holding a taste testing menu in the pub at the same time so the alleged attackers may have assumed he was inside."
McGregor developed the interior of the Black Forge Inn last year, turning it into a combination of a traditional pub and restaurant.
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The venue also offers an array of cocktails, including one called The Fighting Irish.
Responding to the incident on Wednesday night, a spokesperson for An Garda Siochana said: "Gardai are investigating an incident of attempted criminal damage at a licenced premises on the Drimnagh Road, Crumlin last night, Wednesday 12th January 2022.
"No damage was done to the premises. Gardai are appealing for witnesses in relation to this incident is asked to contact Gardai."
They added: "Gardai are particularly keen for anyone with camera footage from the area overnight to make this available to them.
"Anyone with any information is asked to contact Crumlin Garda station on 01 666 2000, the Garda Confidential Line on 1800 666 111 or any Garda station."
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