Real Madrid backed "exemplary" club member Rafael Nadal after the tennis star was accused by a former French minister of failing a drugs test.
Ex-French Minister for Health and Sport Roselyne Bachelot said Nadal's seven-month absence in 2012 was "probably due to a positive doping test".
Nadal, 29, has denied ever doping and the Spanish Olympic Committee said he had passed "countless doping tests".
Real Madrid have defended Nadal from "the attacks made on his person".
A club statement said: "Rafa Nadal represents the fundamental values of sport.
"His greatness and his incredible achievements have always been based upon a foundation of exemplary conduct, unwavering work, talent and astonishing levels of commitment.