Joseph Duffy was forced to withdraw from his UFC Fight Night Dublin main event fight against Dustin Poirier due to a last-minute head injury.
According to Duffy's head coach Firas Zahabi, Duffy was injured Saturday evening -- seven days before the fight.
"He suffered a concussion on the last day of sparring," Zahabi wrote via text message to MMAFighting.com.
Zahabi, who said his fighters "always spar the week before" a fight, did not question the UFC's decision to remove Duffy from the fight. The UFC is serving as the athletic commission for Saturday's event because there is none in place in Ireland.