Tom Danielson (Cannondale) has announced that he has tested positive for testosterone in an out-of-competition control. The American is waiting for the analysis of the B sample and will miss his title defence at the Tour of Utah which starts today.

This morning Danielson sent a series of tweets of announce the news.

"Tonight has been one of the worst nights of my life. While I was eating dinner with my team the night before Tour of Utah I received a call for USADA notifying me that a out of competition test I gave July 9th has tested positive for, from what I understand, synthetic testosterone," he tweeted.

"I have not taken this or any other banned substance. I spoke with them and my team and I will have to sit out the Tour of Utah as I wait for the B sample as well as look into all the possible ways that could have produced this result.

"I would never ever take anything like this especially after everything I have gone through the last years. This makes absolutely no sense. I will now, as I wait for the B test, have the supplements I take, tested to see if this is what caused it.

"I feel incredibly hurt, frustrated, and angry by this. I don't understand how or why this happened and still can't even accept this is true. I love cycling. I love it so fucking much. I love the races, the rides, the people, the businesses, I love it all. Nothing compares for me."

On October 10, 2012, the United States Anti-Doping Agency (USADA) announced that Danielson would be suspended for six months after admitting to doping during his time with Discovery Channel. Later that day, the organization issued a statement confirming his acceptance to a six-month ban from September 1, 2012, to March 1, 2013. The action included the stripping of all race results between March 1, 2005, and September 23, 2006. Danielson released his own statement a day later that expressed regret at his decision to "cross the line." "I accept responsibility for my choices and apologize to everyone in my life for them – in and out of the sport," he said.

Neither the UCI nor USADA have made any official announcements.