Team Sky says sports director Steven de Jongh has left the British squad after admitting to doping during his cycling career.
The Dutchman's departure comes after the team asked staff and riders to confirm whether they had any links to doping in the wake of the Lance Armstrong scandal.
Team Sky says De Jongh "disclosed that he had taken a banned substance earlier in his career as a professional rider."
Team principal Dave Brailsford says "he's been a highly-valued sports director and colleague over three seasons."
De Jongh's exit comes less than a week after American coach Bobby Julich left Team Sky after revealing he took EPO in his racing career.
Team Sky rider Bradley Wiggins won the Tour de France in July.
Wiggins awarded 3rd in 2009 Tour
Tour de France champion Bradley Wiggins has been awarded third place in the 2009 race by the International Cycling Union in the fallout from the removal of Lance Armstrong from the sport's record books for doping.
The UCI ruled last week that Armstrong's seven straight Tour wins from 1999 to 2005 wouldn't be reallocated unlike those from his comeback years after the American chose not to fight the U.S. Anti-Doping Agency's doping evidence.
The UCI told The Associated Press on Monday that Wiggins has risen one spot to replace Armstrong as the third-place finisher in 2009.
USADA recently reported extensive evidence that Armstrong used performance-enhancing drugs during all seven Tour victories. The UCI accepted the sanctions, included stripping Armstrong of his titles.
— The Associated Press