The New York Times and The Associated Press are reporting that a blood sample taken from Alberto Contador at the Tour de France has been found to contain traces of a plastic chemical that could indicate he had taken a blood infusion.
The Times and the AP each cite a source who claims to be familiar with the test results but wishes to remain anonymous because of confidentiality rules.
The German television network ARD first reported the finding last week.
Contador already has been provisionally suspended after a small amount of clenbuterol, a banned substance, was found in a sample taken at the Tour.
The latest test found traces of a plasticizer chemical that is found in plastic IV bags. The test for the plasticizer has been available for about a year and can not be used to directly indicate doping, but can be used as one piece of evidence to establish a non-analytical doping charge.
Contador has denied ever doping and a spokesman said he was unaware of the latest test results. He blames contaminated meat for the clenbuterol positive.
Contador’s spokesman Jacinto Vidarte told VeloNews that Contador has not been notified about the new test results.
“Our decision is not to say anything more while awaiting the decision of the UCI about the possible sanction (or not) to Alberto Contador. Anyway, we have not received any notification on the supposed discovery of plastic debris throughout this process. It is impossible for us to know where they came,” Vidarte said in an email.