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 the team to leave after the zero-tolerance approach to doping was introduced 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 insisted his departure was not drug related.
American Bobby Julich left the squad last week after revealing he took EPO in his racing career.
A Team Sky statement said: "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."