Juventus coach Antonio Conte could be without Giorgio Chiellini for Wednesday's Champions League encounter at home against Celtic.
The Italy international picked up an ankle problem in the Serie A win over Siena in February, and the injury is now once more causing him difficulties.
Chiellini was forced to sit out Monday's training session due to the knock.
And the club is unsure whether he will be match fit in time for the match versus Celtic.
"Giorgio Chiellini missed out on Monday morning's workout in Vinovo after feeling a recurrence of the ankle complaint picked up during February's encounter with Siena," a statement on the official Juve website reads.
The Bianconeri recorded a 3-0 away victory in the first leg of their Champions League round-of-16 tie, and will be looking to seal the deal in the return on Wednesday.