Tiernan-Locke faces hearing
Britain's Jonathan Tiernan-Locke is to face disciplinary proceedings over an alleged "anti-doping rule violation".
Irregularities were initially discovered in the 28-year-old Team Sky rider's biological passport in September.
An International Cycling Union (UCI) statement said: "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].
"Consequently and in compliance with the UCI Anti-Doping Rules, the UCI has requested his National Federation to initiate disciplinary proceedings."
Tiernan-Locke denies any wrongdoing and has vowed to fight the charges.
A statement from his management company, Trinity Sports Management, said: "Jonathan Tiernan-Locke was notified that the UCI wish to instruct British Cycling to instigate proceedings against him regarding an abnormality in his biological passport.
"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."