FIFA has provisionally suspended a Bulgarian international who has failed a drugs test.
The unnamed player tested positive for a banned substance following a World Cup qualifier against Malta on September 10.
FIFA said in a statement: "The chairman of the FIFA disciplinary committee has provisionally suspended a Bulgarian international footballer for an initial period of 30 days following an adverse analytical finding in relation to a doping control."
FIFA said under its anti-doping regulations it can only name the player and the substance he has tested positive for after a disciplinary hearing has confirmed that a doping offence has taken place.
The statement added: "Only after it has been determined in a hearing that an anti-doping rule violation has occurred, or after such hearing has been waived, or the assertion of an anti-doping rule violation has not been timely challenged, may FIFA publicly report the anti-doping rule that has been violated, the name of the player who has committed the violation, the prohibited substance and the consequences imposed."
Bulgaria won the match against Malta 2-1 to consolidate second place in World Cup qualifying Group B.