The former Manchester United man was part of the France team that emerged victorious at the Under-20 World Cup, but he is not taking that success for granted.
"Yes I am returning to Juve as a World Cup winner, but I also know I have to continue working and growing at Juventus," he told Tuttosport.
"Obviously I hope to play and be first choice, but again I can only achieve that by improving. If I am to play in Andrea Pirlo's position, which I have done a few times, then I certainly wouldn't be upset.
"We are stronger than last year, both in Serie A and Europe. The first objective we want to achieve is a third consecutive Scudetto. Then for the Champions League, we'll see."
The 20-year-old made 35 appearances in all competitions for Juve last season.