Pau, France (Sports Network) - Luxembourg's Frank Schleck, who finished third in the Tour de France last year, has tested positive for a diuretic and will not continue in this year's race.

The International Cycling Union said Tuesday it informed Schleck of the presence of Xipamide in a urine sample collected from the rider on Saturday.

Although Schleck has four days to request his B sample be analyzed, his team decided to pull him out of the race immediately, saying it "attaches great value to transparency."

"Even though an abnormal A sample does not require these measures, Mr. Schleck and the team believe this is the right thing to do, to ensure the Tour de France can go on in calm and that Frank Schleck can prepare his defense in accordance with the legal timing to do so," the RadioShack-Nissan team said in a statement.

The Tour didn't kick Schleck out of the race because anti-doping rules don't provide the basis for a suspension for the diuretic, which is a specified substance.

RadioShack-Nissan said Xipamide is not present in any of the medicines the team uses and said it was unclear how it made its way into Schleck's urine sample.

"However, the team is fully determined to collaborate with the anti-doping agencies in order to resolve the matter," the team said.

Schleck stood 12th in this year's race. The positive test was announced on a rest day for the Tour.

07/17 20:53:32 ET