Michael Chiesa was forced to withdraw from his UFC 223 fight against Anthony Pettis by doctors.  He suffered cuts on his face during Conor McGregor’s wild attack at media day.

Via MMA Junkie:

Several members of McGregor’s group began tossing objects at the bus. A window was shattered, and shards of glass opened cuts on Chiesa’s face and forehead. As a result, he’s been ruled off the UFC 223 card. A member of Chiesa’s team confirmed his removal to MMAjunkie.

If this incident was meant to create buzz for the UFC or Conor McGregor the mission was accomplished.  

I highly doubt, after listening to Dana White’s comments on the bizarre attack, that the UFC had any idea that something like this was going to go down.  The UFC President was one unhappy camper or one hell of an actor.