Frank Schleck drinks as he cycles during the sixth stage of the 99th Tour de France. REUTERS/Bogdan Cristel
"Earlier today, the UCI advised the Luxembourger rider Frank Schleck of an adverse analytical finding (presence of the diuretic Xipamide...) in the urine sample collected from him at an in competition test at the Tour de France on 14 July 2012," the UCI said in a statement.
Schleck, who has not been suspended from the Tour de France, has the right to request the analysis of his B sample.