Alberto Contador claims it is "ridiculous" that he has to start the Tour de France knowing he could be stripped of the event if he wins. The Spaniard still has an appeal for a positive drugs test hanging over him. He failed a doping test on his way to victory in last year's Tour, but later cleared. He is still awaiting the outcome of an appeal against the decision to clear him. He said: "From the beginning of the season I've been the rider who's had the most doping tests, and I've been tested in all the races I've been in. "The idea victory could be taken away if I win, I just find ridiculous." Contador is aiming to become the first rider since Marco Pantani 13 years ago to win the Giro d'Italia and Tour de France double Contador tested positive for clenbuterol during last year's Tour. The Spanish federation cleared him of wrongdoing, but the International Cycling Union and the World Anti-Doping Agency are appealing against that verdict. A verdict from the Court of Arbitration for Sport will not come until August at the earliest, so Contador could have any yellow jersey to lose by the time the case is heard. The 28-year-old admits his form is a little surprising given his efforts in Italy. Contador said: "As time goes by, I feel more and more rested [after the Giro] but I'm still a bit in the dark because all I did was rest. "I don't know how I will respond. Undoubtedly, [compared to those who did not ride the Giro], I lack physical but also mental freshness. "I'm very conscious of the fact there has been more pressure on me off the bike, but all I can try and do is fully concentrate on the race. "I have to try not to lose focus and get on with what needs to be done to win."