Additionally, the woman's mother has filed a smaller suit against the UFC star. An associate of McGregor is named as a co-defendant. The Independent first reported the lawsuits. 

The attorney for the woman, David Coleman, said the suit, which was filed in the High Court in Dublin, Ireland, is because of events that allegedly took place in 2018. 

The alleged injury was investigated by the An Garda Síochána, the Republic of Ireland's national police service. Charges were never filed against McGregor, who has denied anything happened.

"After an exhaustive investigation conducted by the Gardaí which, in addition to interviews of the plaintiff, included interviewing numerous sources, obtaining witnesses' statements, examining closed-circuit footage and the cooperation of Conor McGregor, these allegations were categorically rejected," McGregor spokesperson Karen Kessler said in a statement.

"The plaintiff knows the facts contradict the assertions in this lawsuit. Mr. McGregor will dispute any claims and is confident that justice will prevail."

In 2019, The New York Times reported that McGregor was being investigated for two alleged sexual assaults. No charges have been filed against McGregor, and it is unknown if those investigations are still ongoing. 

McGregor steps back into the Octagon this week for the first time in over a year, as he takes on Dustin Poirier in the main event of UFC 257 on Saturday from Etihad Arena in Yas Island, Abu Dhabi. 

ESPN asked Coleman about the timing of the lawsuit being so close to UFC 257. He said there was "no specific reason" as to why it was filed this week.