Former Chelsea and Barcelona star, Deco will face a 30 day suspension after the B sample taken from him for a drug test also returned positive result.
The 35 year old Portuguese midfielder had tested positive for the use of diuretic furosemide earlier in the week.
Deco had protested the positive result, insisting that it all might be a misunderstanding as he uses vitamin supplements. He vowed to fight on until his name is cleared.
However, the B sample has also returned a positive result, which means that the Portuguese star is now confirmed guilty, and will start his sentence.