UFC heavyweight champion Junior dos Santos always had the idea in the back of his mind that he might not be facing Alistair Overeem in his first title defense.

Dos Santos found out after Overeem ran into trouble with acquiring his fight license that he would be facing Frank Mir at UFC 146. The card will take place May 26 from Las Vegas.

“It wasn’t really a big surprise for me,” said dos Santos, in a recent interview with USA Today. “I don’t know. I’ve heard lots of stories about people getting caught in drug tests. You hear through the grapevines that people use substances that are performance enhancing, so it wasn’t a big surprise.”

Dos Santos added that he has never used anything illegal to gain an extra inch in the UFC. “Cigano” claimed the title with a first round victory over Cain Velasquez last year. He suffered knee damage in the pre-fight training, thus, he’s yet to compete since winning the belt.

Mir has been on a roll as of late, including a submission victory over Antonio Rodrigo Nogueira. Nogueira is the mentor and frequent training partner for JDS, so there could be some bad blood brewing once these two step inside the Octagon later this month.

Photo credit: Esther Lin/MMA Fighting