A "second-tier" rider at the Tour de France has tested positive for traces of a restricted substance, according to the International Cycling Union (UCI).
The positive test came after stage five of this year's Tour
The rider will remain unnamed pending investigation, but UCI spokesman Enrico Carpani said it was not a top cyclist.
"It's a second-tier rider - not Lance Armstrong or Robbie McEwen, nor any of the leading riders," said Carpani.
The unidentified rider tested positive for norpseudoephedrine on 6 July after the fifth stage, which McEwen won.
Norpseudoephedrine, also known as cathine, is related to pseudoephedrine, an ingredient in Sudafed and other over-the-counter cold remedies.