Two leading newspapers in France say the Astana team of Tour de France winner Alberto Contador and third placed Lance Armstrong were given an easy ride during dope tests this year.
Le Monde and Le Figaro quoted a report by the French anti-doping agency AFLD accusing the International Cyclist Union of failing to apply the rules properly.
They say Astana was always allowed to have the last tests in the morning rather than random times.
Astana has had a stormy year with its financial future repeatedly in doubt.
After Spain's Contador won the Tour, his American team-mate Armstrong, the seven-time Tour champion, promptly quit and has joined the new US team Radio Shack.