Kolobnev denies doping after positive test at the Tour de France

Alexsandr Kolobnev (Katusha) could be an outsider for victory

Alexsandr Kolobnev (Katusha) could be an outsider for victory (Image credit: Stephen Farrand)

Alexandre Kolobnev has claimed he does not know how the banned substance hydrochlorothiazide was discovered in his urine sample taken after stage five to Cap Fréhel and has insisted that he has not been sacked by his Katusha team.