The 37-year-old, who played at three World Cups and won the Copa Libertadores with Paraguay’s Olimpia in 2002 and the Argentine league title with Boca Juniors in 2008, tested positive for octopamine in August.
Caceres was handed a two-match ban for that offence and had it doubled for refusing to take a test after a Paraguayan league match in December.
His club Guarani, the Paraguayan champions, said they would appeal against the ban.
(Reporting by Daniela Desantis; Writing by Rex Gowar, editing by Ed Osmond)
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