Michael Phelps, the most decorated Olympian of all time, believes he never raced against a completely clean international field.
The American former swimmer, 31, wants US lawmakers to push for global anti-doping reforms.
"I don't believe I've stood up at an international competition and the rest of the field has been clean," he said.
Phelps was giving evidence at a US House of Representatives hearing into improving anti-doping measures.
Phelps, who won 23 Olympic gold medals, added: "Throughout my career, I have thought that some athletes were cheating and in some cases those suspicions were confirmed."
"Given all the testing I and others have been through, I have a hard time understanding this." Phelps spoke out against drugs cheats at the Rio Olympics.
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