Former Team Sky doctor Geert Leinders has been banned from cycling for life for multiple doping violations, the United States Anti-Doping Agency has announced.
Leinders was banned for violations committed while he was the chief team doctor and a director of the Rabobank cycling team between 1996 and 2009.
Leinders worked for Sky on a freelance basis in 2011 and 2012 and team principal Sir Dave Brailsford later described it as a mistake.
The USADA said in a statement: "After a hearing at which the detailed evidence, including eyewitness testimony, corroborating documentation and an expert analysis of abnormal blood values of cyclists was presented, the independent arbitration panel found that Leinders possessed, trafficked, and administered banned performance-enhancing substances and methods without any legitimate medical need, including EPO, blood transfusion paraphernalia, testosterone, insulin, DHEA, LH and corticosteroids to athletes under his care, and was complicit in other anti-doping rule violations."
The USADA said it had discovered evidence of doping by Rabobank during the course of an investigation in 2012, and worked with its equivalent organisations in Denmark and Holland to bring Leinders to account.
Team Sky's new signing Nicolas Roche says it would be a dream come true to help Chris Froome win the Tour de France this year.
Roche, who has raced 13 Grand Tours already in his career, was one of five new riders to join Sky in September and is expected to play a major role in Froome's bid for glory in July.
The Irishman's move also weakens Froome's main rival in Paris, Alberto Contador, who previously enjoyed Roche's support at Tinkoff-Saxo.
Team Sky, who Bradley Wiggins rides for, has said the Tour de France winner is expected to "make a full and speedy recovery":