Team Sky head Sir David Brailsford has hit back at UK Anti-Doping (UKAD) chairman David Kenworthy after he claimed answers given in front of a parliamentary select committee by were "very disappointing".
Sir David along with former coach Shane Sutton and British Cycling President Bob Howden spoke to the Commons' Culture, Media and Sport Select Committee in December.
They were summoned to answer questions on anti-doping and the mystery medical package delivered to Sir Bradley Wiggins during the 2011 Criterium du Dauphine.
Sir David told the hearing that he had been informed the package contained fluimucil - a product used to treat coughs and sore throats.
This came after, he claimed, permission was given by UKAD for him to make public its contents.
A UKAD investigation is currently ongoing related the contents of the package which saw Team Sky doctor, Simon Cope, travel from Geneva to La Toussuire with requested medication on June 12, 2011.
Britain's five-time Olympic champion Wiggins won the seven-stage race, a traditional build-up race to the Tour de France.
Kenworthy, speaking to the BBC, had claimed there had been no definite answer from anyone who was involved.
But Sir David, speaking at Team Sky’s annual media day in Mallorca ahead of the new season, hit back at Kenworthy.
“The only extraordinary thing I could see was that he [Kenworthy] actually commented on the whole process himself,” he told the BBC.
“To me that is extraordinary in itself.
"Most fair-minded people recognise there's a process in place to try to get to the bottom of something and it is a diligent process, and that there is an open investigation which is still ongoing.
“For the chair of that organisation to discuss the actual contents of that investigation while it is live and open, that is the extraordinary thing in my mind.”
Sir David also dismissed suggestions the case had damaged the reputation of Team Sky or had cast a cloud over Wiggins achievements.
The "mystery package" story, broken by the Daily Mail in October, came after the Fancy Bears hacking group leaked World Anti-Doping Agency (WADA) data.
They alleged Sir Bradley received permission to use salbutamol to treat asthma in 2008 before receiving three successive exemptions for corticosteroid triamcinolone acetonide in 2011, 2012 and 2013 due to a pollen allergy.
His three approvals for triamcinolone acetonide coincided with the Tour de France in 2011 and 2012 and the Giro d'Italia in 2013 - his biggest races of all three seasons.
All parties have denied wrongdoing.