“Why are we still not seeing news that Yang passed a positive test? The same with TJ Dillashaw, who passed a positive test. But USADA never caught TJ, he was caught by the New York State Athletic Commission. I have my own convictions. Maybe he's clean, maybe he's not. He withdrew from the first fight for personal reasons - I don't know what that means. No one else is removed from fights with such a wording. There is a lot of skepticism on my part here.
People cheat and constantly pass the USADA test. This is not an ideal system. I have never taken a positive test - maybe he thinks the same about me, I don't know. It's part of the game, you don't know for sure and you hope your opponent is playing fair," Sterling said.
The fight between Sterling and Jan 2 will take place at UFC 273, which will be held on the night of April 10 in Jacksonville.