LONDON (AFP) - Team Sky coach Shane Sutton confirmed on Monday that a mysterious package delivered to Bradley Wiggins' doctor during the 2011 Dauphine Libere contained medical substances.

UK Anti-Doping is probing alleged wrongdoing at Team Sky and British Cycling, who share headquarters, and the package, delivered by British Cycling coach Simon Cope, forms part of its investigation.

Team Sky boss Dave Brailsford has refused to clarify exactly what the package contained, but Sutton confirmed it was medicine that would have been administered by team doctor Richard Freeman.

"I believe (Freeman) administered the medication," Sutton told the British government's Culture, Media and Sport committee during a hearing about doping in sport in central London.

"Obviously there was a medical supply he (Cope) delivered. I don't know what was in the package. Whatever it was, he (Freeman) would have administered.

"When the ingredients of the package comes out, everybody will be clear. I'm quite sure, 100 per cent, there'll be no wrongdoing."

The Daily Mail has reported the package was delivered on the day Wiggins won the Dauphine Libere stage race in France, giving him the biggest victory of his career at that point.