British Cycling president Bob Howden insists he is prevented from confirming what was in a package delivered to Sir Bradley Wiggins five years ago due to the ongoing UK Anti-Doping investigation into the matter.
Wiggins announced his retirement on Wednesday but the contents of the package given to him at the end of a race in France in 2011 are the subject of a UKAD probe into alleged "wrongdoing".
Team Sky principal Sir Dave Brailsford told a Department of Culture, Media and Sport select committee last week that the package contained fluimucil, an over-the-counter decongestant available relatively cheaply in France.
But that does not explain why the team went to such lenghts to have it personally delivered to Wiggins by British Cycling coach Simon Cope. All parties deny wrongdoing.
Damian Collins MP, the chairman of the select committee, said in Thursday's edition of The Times that evidence provided by British Cycling failed to confirm Brailsford's explanation, adding that the "more we discover about the package, the more questions seem to be thrown up".'
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But Howden told BBC Radio 4's Today programme that all the records needed to prove the drug was just a decongestant as claimed have been supplied.
"Obviously it's difficult to talk in detail about this because it's the subject of an ongoing UKAD investigation," Howden said.
"What I can say is that the information that was requested at the Commons select committee has been forwarded to the chair of that committee (Damian Collins).
"That included the information around what was in the package and who sent the package, and that has been sent through to the Commons select committee.
"The information has been sent through in terms of the details of the flights, the transportation details, that went with the package.
"What we're obviously not able to comment on are the actual exact medical requirements that were in place, because they are issues between doctor and athlete and it's a matter that UKAD are looking into."
Nicole Cooke, Olympic road race champion at Beijing 2008, also believes the committee's findings have "raised even more questions than we had before".
Speaking to The Guardian, she said: "At the end of the three hours we were informed by Brailsford that the mysterious content of the jiffy bag was a E10 'decongestant' that was available over the counter in any of eight pharmacies located within 5km of where the team bus was parked in France.
"It was an answer that raised even more questions than we had before, especially now that we know Simon Cope spent two days travelling to deliver it."
