The positive test regards a sample Pogba gave after Juve’s opening game of the Serie A season away at Udinese last month, sources said.
The Turin giants won the game in Udine 3-0.
Pogba, 30, did not play in the match but he did take the field in the subsequent games against Bologna and Empoli.
The shock news come as Pogba looked to be coming out of a difficult period on both the professional and personal fronts.
He was dogged by injury problems last season after returning to Juve from Manchester United and was also the victim of attempted extortion allegedly involving his brother Mathias.
“Money changes people and it can destroy a family. It can create a war,” he told Al Jazeera.
“Sometimes when I was alone, I used to think ‘I don’t want to have money any more, I don’t want to play football any more’.
“Now I want to make the critics eat their words and show that I’m not weak.”
ANSA
