A ban of 4 years could mean the end of his professional football career at the same time. Because he is already 30 years old now. He might just return to football to play for Saudi teams for money maybe but not more than that.
I feel sorry for him for what happened. According to him, he said he took a food supplement that was prescribed to him by a doctor friend in the united states which later tested positive to testosterone metabolites. I really hope he's telling the truth because he's career is already at rock bottom. Juventus almost terminated his contract during the summer to save the club a €10 million per annum wage but they later had a change of heart. As a result of the failed drug test, Juventus has slashed his salary to €2000/month and might terminate his contract pending on the final decision of the Italian sport judiciary council.