David Millar's Olympic ambitions have been dented by the decision of Cofidis to temporarily quit all competition.
The Scot, who rides for the French cycling team, was due to race for Great Britain in the team pursuit at the World Cup track event in Manchester.
But he was forced out after Cofidis, hit by a doping scandal, said they would not race until further notice.
Millar could still compete in the team pursuit in Athens as well as the road time-trial, his favourite discipline.
"We respect the decision of his professional team management," said Team GB performance director David Brailsford. "We remain 100% fully supportive of David Millar's Olympic aspirations."