Former Chelsea and Portugal playmaker Deco has had his positive test for a banned diuretic confirmed after his 'B' sample was returned.
The 35-year-old Fluminense player now faces an automatic 30-day ban although he plans to fight against a suspension, claiming the positive test is the result of a contaminated vitamin supplement.
Deco was tested after Fluminense's 2-0 win over Boavista on
In a statement on its website, Fluminense said the player had hired his own legal team to represent him in the case while the club was also retaining its own lawyers.
Fluminense opened its Campeonato campaign in style with a 3-0 victory over recently-promoted Figueirense.