Fuentes had been barred from practicing sports medicine for four years in 2013.
WADA had since then been calling on Spanish authorities to release the blood samples, though Spanish courts had until now said evidence from the case would not be released to anti-doping authorities for further investigations.
"Operation Puerto" was started in 2006 when authorities seized anabolic steroids, blood transfusion equipment and dozens of blood bags labelled with code names in Madrid, sending shock waves through the international sports community.
(Reporting by Emma Pinedo, writing by Paul Day; Editing by Julien Toyer)
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