(More) bad news for the Irish fans.
UFC Fight Night 76 headliner Joseph Duffy suffered a mild concussion during training earlier this week, and by doctors and the UFC, has been deemed un-fit to face Dustin Poirier this Saturday.
UFC officials announced the injury on Wednesday.
Promoted to the main event is a flyweight matchup between top prospects Louis Smolka and Paddy Holohan.
Smolka is coming off a big win over Neil Seery this past summer at UFC 189. Prior to that, he picked up a knockout win in late 2014, which got him back into the winning column following his first pro-loss to Chris Cariaso.