Jonathan Tiernan-Locke has vehemently denied any wrongdoing after the International Cycling Union opened disciplinary proceedings over alleged doping by the British Team Sky rider.
Discrepancies in the 28-year-old's biological passport data demonstrated an anti-doping violation, according to cycling's world governing body, and he will not take part in any duties with Team Sky until a decision is made in the disciplinary process.
Tiernan-Locke, the 2012 Tour of Britain winner, maintains his innocence, but will have to wait for a resolution as there is no clear timescale in place.
A statement released by Tiernan-Locke's management company read: "Mr Tiernan Locke vehemently denies the charges brought against him and has informed the UCI that he fully intends to contest them.
"Mr Tiernan Locke will not ride for Team Sky, attend training camps or undertake any team duties until a decision is made in these proceedings.
"Mr Tiernan Locke is looking forward to a speedy and just resolution of these unfortunate charges. Until a decision has been reached, Mr Tiernan Locke will make no further comment on the matter."
The Plymouth rider withdrew from the Great Britain team for the Road World Championships road race at the end of September, citing poor form.
But on the day of the event it was revealed he had withdrawn from competition over "possible discrepancies" in his biological passport and he was asked to explain his results to the UCI.
Tiernan-Locke has battled with chronic fatigue syndrome in the past and illness may form part of his defence, but nearly three months on, it appears his explanation was not adequate after the UCI instructed British Cycling to discipline the rider.
"The analysis of the biological passport of Mr Jonathan Tiernan-Locke by the experts panel has demonstrated an anti-doping rule violation (use of prohibited substances and/or methods)," a UCI statement said.
"Consequently and in compliance with the UCI anti-doping rules, the UCI has requested his national federation to initiate disciplinary proceedings."
British Cycling confirmed it had received the UCI's request and that "those proceedings will be managed independently of British Cycling by UK Anti-Doping".
Team Sky, which has a zero-tolerance policy to doping, on Tuesday reiterated its stance from September, insisting the period in question occurred prior to his employment with them.
Tiernan-Locke remains under contract for another year, but it is conceivable he will never pull on the black and blue uniform again, even if cleared.
A team statement read: "We understand that the violation was highlighted by an anomaly in his biological passport, in a reading taken before he signed for this team.
"There are no doubts about his approach or performance in Team Sky. This is a team that trains, races and wins clean.
"Jonathan Tiernan-Locke will not ride for Team Sky or take part in any team activities - including training camps and all team duties - until a decision is made in this disciplinary hearing process.
"At this stage, we will add no further detail until this initial disciplinary process is concluded."
Tiernan-Locke won the 2012 Tour of Britain to seal his move to Team Sky, where illness and injury contributed to a disappointing season.
He won the Tour of Britain while racing for Endura, with whom he also won the 2012 Tour of the Mediterranean and the 2012 Tour du Haut Var.
Endura issued a firm defence of itself after the investigation into Tiernan-Locke was opened and declined to comment further.
"Endura is aware that the UCI have decided to instruct British Cycling to open disciplinary proceedings against Jonathan Tiernan-Locke due to irregularities in his biological passport," an Endura statement read.
"Whilst this is disappointing news, Endura has not been provided with any details of the biological passport anomalies since making its last statement on the matter on October 1, 2013 and so will not comment further at this time."