Benedikt Howedes is a doubt for Juventus' derby clash with Torino on Saturday.
The Germany international, who joined Juve from Schalke on a one-year loan deal in August, suffered a thigh injury in training on Thursday.
A statement on Juve's website read: "During today's training session, Benedikt Howedes reported a muscular issue to the left thigh, which will be evaluated in the coming days."
Juve go into this weekend's match second in Serie A behind Napoli after beating Fiorentina 1-0 on Wednesday.
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