Lamont Peterson is refusing to bow to calls from Amir Khan to surrender his IBF and WBA titles.
The American was due to meet Khan on 19 May in a rematch of their
light-welterweight clash, which Peterson won in controversial
circumstances.
However, Peterson failed a drugs test after testing positive for a
synthetic testosterone, forcing the Las Vegas meeting to be cancelled.
The 28-year-old insists he had a testosterone pellet inserted in his
hip for medical reasons and there was no intention to gain an advantage.
His case will be discussed by the Nevada State Athletic Commission in
June and until they publish their findings, Peterson says he will not
be giving up his titles.
He said: "Let the commission decide, let the sanctioning bodies decide. Until that point I'm still the champ.
"I've never been a cheat. I don't like it when people cheat. It's
just my word but the pellets didn't do anything to help me beat him."