Conor McGregor says Dennis Siver 'could be entering this contest on performance-enhancing drugs' http://www.mmafighting.com/2015/1/1...-mcgregor-says-dennis-siver-could-be-entering "I feel he has been on that stuff his whole career and who knows his evolution?" McGregor said Tuesday on ESPN2's Highly Questionable. "He has probably evolved his skills of hiding the substance. So as far as I'm aware, he could be entering this contest on performance-enhancing drugs as it is. I do not respect an individual like that." "He has two options," McGregor said. "He can either retire or he will be cut from the promotion. On the night, on the air, I will cut him myself as I believe I am shaping up to become vice president of the UFC pretty soon. So I will be making cuts myself."