The 22-year-old left back spent last season on a successful loan deal at Italian Serie A's Roma soccer club, reports Xinhua.
"His pace on the left makes him a threat going forward as does his excellent technical quality on the ball," Barca said in a statement on Wednesday.
Digne was part of Didier Deschamps' 23-strong France squad for Euro 2016, but didn't play a single minute.
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