McGregor has been accused of battery, assault and intentional infliction of emotional distress.
Conor McGregor is facing a civil lawsuit after being charged in South Florida with stealing the cellphone of someone who was trying to take his photo, as reported by AP.
McGregor was recently released from jail after being arrested and charged with robbery and criminal damage in Miami.
The Dubliner allegedly smashed a fan's phone in an altercation.
He was released from custody in the Florida city after posting his bond of $12,500.
AP have now reported that Miami-Dade County court records show that 22-year-old Ahmed Abdirzak has filed a lawsuit seeking more than $15,000.
Mr Abdirzak is accusing McGregor of battery, assault and intentional infliction of emotional distress.
Police say that McGregor slapped the phone out of Abdirzak's hand and then stomped on it several times. The MMA fighter was then arrested on robbery and criminal mischief charges.
McGregor's attorney has called the lawsuit "a quick effort seeking a payday."
On Tuesday morning, the Irish MMA fighter took to Instagram for the first time since the arrest, thanking his fans and admitting that he will continue to work on his patience.
"Patience in this world is a virtue I continue to work on. I love my fans dearly. Thank you all," said McGregor, with a post accompanied by a photograph of him leaving the jail".