World cycling's governing body says doping samples of the top five riders in the Giro d'Italia, Tour de France and Vuelta a Espana will be stored for 10 years for possible retesting in the future.
"The UCI, the CADF and the AFLD have agreed to keep the samples for potential retrospective analyses in the future," the UCI said in a statement."
"As for all Grands Tours, all the collected samples concerning the best five riders in the general classification will be kept for 10 years for potential retrospective analyses."
The UCI says a total of 656 doping controls were carried out during this year's Tour de France, which was won by Team Sky's Chris Froome.
Other riders in the collection pool would include Alberto Contador and Rafal Majka from Tinkoff-Saxo, Movistar's Nairo Quintana and Alejandro Valverde, Astana trio Fabio Aru, Vincenzo Nibali and Mikel Landa, Joaquim Rodriguez (Katusha), Ryder Hesjedal (Cannondale-Garmin) and Esteban Chaves (Orica-GreenEDGE).
Of those controls, 482 were blood tests and 174 urine tests. The blood tests were analysed in relation to the biological passport and for specific anti-doping analyses.
The UCI said those samples will also be kept for "potential retrospective analyses in the future".
“I would like to highlight once again the excellent climate in which all the stakeholders involved in the fight against doping work together on a daily basis for the benefit of our sport," UCI President Brian Cookson said.
"In particular, I would like to congratulate the AFLD (French anti-doping agency) and the CADF (Cycling Anti-Doping Foundation) for their collaboration on this 2015 Tour de France.
"Thanks to the sharing of information between all anti-doping actors and a strategy focused on even more targeted controls, we can be confident of the robustness of our programme.”