Pogba claims the testosterone came from a dietary supplement prescribed by a U.S. doctor.
He has seven days to submit his defense to the National Anti-Doping Tribunal.
A judicial investigation will be opened in Italy due to doping being considered a criminal offense.
Pogba cannot train with Juventus Turin, and his salary payments are suspended.
The doping scandal adds to a difficult year-and-a-half for Pogba, including injury and extortion attempts.
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