The United States Anti-Doping Agency (USDADA’s) last night exonerated Chris Horner of any wrong doing over officials’ inability to find him for an out-of competition doping test yesterday morning.

Testers arrived at the RadioShack team hotel yesterday morning only to find that Horner was not present as he’d moved to another hotel in order to spend the night with his wife.

As rumours swirled about Horner supposedly missing a test, the team published a confirmation email from USADA’s whereabouts system, demonstrating that Horner had notified the agency on Sunday morning of the hotel change.

USADA has conceded this, and said that the updated information did not reach the testers in time.

In a statement, the USADA said: "In response to public statements from Team RadioShack today concerning Chris Horner, USADA can confirm that we were coordinating an out-of-competition test with the Agencia Española de Protección de la Salud en el Deporte (AEA) while Mr. Horner was in Spain.

"Mr. Horner properly updated his whereabouts information in advance of the test attempt, but given that the information was received in the United States, the AEA doping control officer on the ground in Spain did not receive the updated information prior to arriving at the hotel.

"This is not considered a missed test and neither anti-doping organisation provided information to the media regarding this situation."

On Sunday, Chris Horner finished the Vuelta a España in the leader's jersey to became the oldest grand tour winner ever, at 41.