The World Anti-Doping Agency have stated that they are shocked by claims that a new 'undetectable' muscle-growth drug has been offered for sale.
The drug - named Full Size MGF - is said to develop the muscles of any user at twice the natural rate, and is reportedly not able to be picked up by regular tests.
Official testing has only occurred on animals and according to a German television channel, it carries a street price of £83,000 if an athlete wishes to "prepare" themselves for the 2014 Winter Olympic Games this way.
At a WADA news conference at the Sochi's Olympic Park on Thursday, director general David Howman spoke of the illegal sale of performance-enhancing drugs, stating that anything not reported to them by pharmaceutical companies is something of a concern.
Howman said: "We are aware the black market exists for products in the research and development process for medical companies and are being stolen.
"That's why we have an arrangement with the pharmaceutical industry so that when we are aware of products being made available on the black market we let them know.
"It's very shocking that Full Size MGF was only trialled on animals. That is outrageous but it is not surprising."
Over 2,500 drug tests will be completed during the Games, with over another thousand tests to be carried out over the following months.
