The suspension imposed by the Fifa disciplinary committee covers "all types of matches" and was backdated to start on November 3, football's governing body said on Friday (Saturday NZ Time).
The 33-year-old Guerrero tested positive for "cocaine metabolite benzoylecgonine," a banned stimulant, after a World Cup qualifying game in Argentina on October 5.
He can appeal to Fifa to overturn the ban. If that fails, Guerrero and the Peruvian football federation have a further legal route at the Court of Arbitration for Sport in Switzerland.
