Mixed martial arts star Conor McGregor is being sued by UFC lightweight fighter Michael Chiesa after and alleged attack in April.
Chiesa is seeking damages he suffered when McGregor allegedly threw a dolly (a cart for moving heavy items) at a bus window, injuring Chiesa and forcing him to withdraw from the UFC 223 card on April in Brooklyn, New York.
The incident was captured on camera at the Barclay's Centre.
TMZ reported that the lawsuit was filed overnight and alleges Chiesa suffered "serious personal, economic, other injury" and "severe emotional distress, mental trauma and bodily harm."
The lawsuit accuses McGregor of assault, battery, negligence and infliction of emotional stress.
Chiesa is also named the Barclay's Centre as a defendant, saying the organisers at the venue failed to take "proper security measures to protect the plaintiff and other patrons."
The American fighter doesn't specify the amount he is after, but is asking for compensation lost which includes "lost opportunities".
He argues that the incident robbed him at a shot at a UFC title, with the UFC needing a last-second replacement for the lightweight title fight at the UFC 223 event, which Chiesa was unavailable for due to injury.
McGregor agreed to a plea deal with the Brooklyn District Attorney's office in July which allowed him to avoid a criminal record.
He pled guilty to a single charge of disorderly conduct. The 30-year-old is set to return to the Octagon at UFC 229 on October 7 (NZ time).
Chiesa recovered from his facial lacerations and went onto fight Anthony Pettis at UFC 227 in July in Las Vegas.