In the wake of Maria Sharapova’s announcement that she failed a drug test earlier this year, tennis star Rafael Nadal has denied he has ever used a banned substance to get an edge or to speed up recovery from injury.

In 2011, former French open champion Yannick Noah wrote a newspaper article saying Spanish sporting success was due to doping.

Then in 2013, Belgian former professional player Christophe Rochus questioned Nadal being able to dominate the 2012 French Open and then be injured two weeks later at Wimbledon.

But Nadal says no one can question his credibility.

Said Nadal, “You know what? I am hurt about the accusations a few times again.” The 14-time Grand Slam champion told reporters Wednesday night after being asked for his reaction to Maria Sharapova’s failed drug test, “I am a completely clean guy. I have never had the temptation of doing something wrong. When I get injury, I get injury. I never take nothing to be back quicker.”

On Tuesday, Roselyne Bachelot, the former French secretary of sport, accused Nadal of doping in 2012, echoing accusations made by former French Open champion Yannick Noah in 2011 and by former Belgian pro Christophe Rochus in 2013.

“We know that Nadal’s famous seven-month injury was without a doubt due to a positive drug test,” Bachelot told French TV show “Le Grand 8” on Tuesday morning. “When you see a tennis player who stops playing for long months, it is because he has tested positive and because they are covering it up. It is not something that always happens, but yes it happens more than you think.”