Three-time Tour de France winner Alberto Contador of Spain has withdrawn from the Dempsey Challenge this weekend.

An announcement on the Dempsey Challenge website said that Contador was unable to travel to the United States because of a personal matter.

It was announced earlier this week that Contador had tested positive for the banned substance clenbuterol after his Tour de France victory in July. Contador has said it was the result of food contamination.

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