The midfielder limped off during Slovakia’s 2-0 victory over Cyprus last night and returned to the Castel Volturno training ground today.
A statement from the club confirms tests showed the elongation of the right femoral bicep.
According to Calciomercato.com, the recovery time is believed to be 10-15 days, which would rule him out of not only the Juventus match this weekend, but also the upcoming Europa League opener with Leicester City.
With Diego Demme and Piotr Zielinski also carrying injuries, this leaves coach Luciano Spalletti with limited alternatives for the middle of the park.
New signing Andre-Frank Zambo Anguissa had his first training session today after his loan move from Fulham and could be thrown straight into the starting XI on Saturday.