A Swiss tribunal agreed on Thursday to lift a 14-month suspension,imposed by the Court of Arbitration for Sport (Cas), while it considered the 34-year-old Flamengo striker’s appeal.
Midfielder Sergio Pena, 22, was the player cut to make way for Guerrero.
The Granada player said: “This is the most difficult moment of my career.”
uerrero tested positive for cocaine metabolite benzoylecgonine in October.
The sample was taken after Peru’s World Cup qualifier against Argentina and Guerrero – who insisted the positive test was the result of drinking contaminated tea – was initially banned for 12 months by Fifa.
That suspension was then halved by Fifa’s appeal committee but the World Anti-Doping Agency appealed to Cas and, less than two weeks after his six-month ban ended in May, it was extended it to 14 months.
A Swiss tribunal has now ruled that the extension was “unjustified” and is “provisionally deprived of effect”, leaving Guerrero free to play in Russia.