Steven de Jongh has left his role as a sporting director at Team Sky after admitting to taking performance-enhancing drugs during his cycling career.
De Jongh is the third member of Team Sky staff to leave the Tour de France-winning team after the zero-tolerance approach to doping was restated in the wake of the Lance Armstrong affair.
Sean Yates announced his retirement from professional cycling yesterday, leaving his role as senior sports director but refuting reports his departure was forced.
American Bobby Julich left the squad last week after revealing he took EPO in his racing career.
A Team Sky statement read: "Steven de Jongh has left Team Sky following three seasons as sports director.
"After the team reaffirmed its position on anti-doping, Steven disclosed that he had taken a banned substance earlier in his career as a professional rider."
Team Sky principal Dave Brailsford said: "There's no doubt about Steven's work with us or his approach. He's been a highly valued sports director and colleague over three seasons.
"Steven deserves our respect for the courage he's shown in being honest about the past and it's right that we do our best to support him.
"He has our best wishes for the next step in his career."
Elsewhere, Bradley Wiggins has been awarded third place in the 2009 Tour de France after Lance Armstrong's result was wiped from the record books.
Wiggins, who won the 2012 Tour, placed a then British record-equalling fourth three years' ago behind Alberto Contador, Andy Schleck and Armstrong.
Now, after the UCI stripped Armstrong of all results from August 1, 1998, ratifying a ruling by the United States Anti-doping Agency, Wiggins is a two-time Tour podium rider.