A Bulgarian international's provisional suspension for failing a drugs has been revoked by Fifa just hours after world football's governing body imposed it.
The ban was dismissed after advice from FIFA's medical experts.
FIFA said in a statement: "The chairman of the FIFA disciplinary committee has revoked his decision to suspend a Bulgarian international footballer for a period of 30 days.
"The decision was taken following clarification by medical bodies, on the basis of which it appears that there is no circumstantial evidence that anti-doping rules have been violated."
The unnamed player tested positive for a banned substance following Bulgaria's World Cup qualifier against Malta on 10 September.
Bulgaria won the match 2-1.