U.S. star goalkeeper Hope Solo received a public warning from the U.S. Anti-Doping Agency Monday after testing positive for a prohibited substance. The warning will not affect Solo's Olympic participation.

Solo, considered the world's best women's goalkeeper and expected to play a vital role in the United States' quest for a third consecutive Olympic gold medal, tested positive for canrenone. The test was the result of an out-of-competition urine test collected June 15.

Since USADA has classified canrenone, a diuretic, as a specified substance, the presence of the drug can result in a reduced sanction. Canrenone is on the banned substance list because diuretics can be used as masking agents.

Solo, 30, said she took a medication prescribed by her personal physician for premenstrual purposes and she did not know it contained a diuretic.

"Once informed of this fact, I immediately cooperated with USADA and shared with them everything they needed to properly conclude that I made an honest mistake, and that the medication did not enhance my performance in any way," she said in a statement. "As someone who believes in clean sport, I am glad to have worked with USADA to resolve this matter and I look forward to representing my country at the 2012 Olympic Games in London."

U.S. Soccer said in a statement it "cooperated with USADA . . . to ensure it could be resolved quickly. Hope and the rest of the women's national team staff and players are looking forward to continuing preparations for the 2012 Olympics."

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Losing Solo would be devastating for Team USA, which needs her expertise and experience to backstop a sometimes shaky back line.

The U.S. team begins its gold-medal defense against France in Glasgow on July 25, followed by group matches vs. Colombia in Glasgow on July 28 and North Korea in Manchester on July 31. The quarterfinals are set for Aug. 3, followed by the Aug. 6 semifinals and Aug. 9 gold-medal match in London.