Former Team Sky doctor Richard Freeman and ex-British Cycling employee Simon Cope have been summoned to appear before a House of Commons Select Committee as MPs try and establish exactly what was in a Jiffy bag containing medicine to be used by Sir Bradley Wiggins that was delivered to Team Sky at the 2011 Critérium du Dauphiné.
Appearing before the Culture, Media and Sport Select Committee last month, Team Sky principal Sir Dave Brailsford said the package contained the decongestant Fluimucil, which is not on the World Anti-Doping Agency's banned list.
However, the committee's chair, Damian Collins, has expressed strong concerns about the lack of a paper traile concerning the contents of the package.
In a statement today, Collins confirmed that Nicole Sapstead, chief executive of UK Anti-Doping (UKAD), which is conducting its own probe into the episode, will appear before the committee on 22 February to give evidence.
What is not in doubt is that Cope, who was manager of the Great Britain elite women's road team at the time, took the package from the UK to France via Geneva, and expense records published by the committee show that he made the return trip on the same day, with the costs of the trip charged to Team Sky.
The contents of the package are said to have been handed to Freeman, who reportedly administered the medicine to Wiggins - who had just secured the overall win at the race - in the Team Sky bus.
UKAD confirmed to the committee that it had no objection to Cope and Dr Freeman being asked to testify, and they have been invited to give evidence on the same day as Sapstead.
Collins said: "There is a considerable public interest in UKAD's investigation and it is also important to our inquiry into doping in sport to understand what they have been able to determine from their investigation.
"The committee has been told by both British Cycling and Team Sky that they have supplied all the information they have relating to this investigation to UKAD. However, we need to know if they have received documentary evidence which confirms what was in the package that was delivered by Simon Cope to Team Sky.
"Without this evidence, I am concerned about how it is possible for the anti-doping rules to be policed in an appropriate manner, if it is not possible to review the records of medicines prescribed to riders by the team doctors.
"I hope that on 22 February, if not before, we will receive clear evidence on this important matter," he added.
Born in Scotland, Simon moved to London aged seven and now lives in the Oxfordshire Cotswolds with his miniature schnauzer, Elodie. He fell in love with cycling one Saturday morning in 1994 while living in Italy when Milan-San Remo went past his front door. A daily cycle commuter in London back before riding to work started to boom, he's been news editor at road.cc since 2009. Handily for work, he speaks French and Italian. He doesn't get to ride his Colnago as often as he'd like, and freely admits he's much more adept at cooking than fettling with bikes.