Juventus says coach Maurizio Sarri has been diagnosed with pneumonia.
The 60-year-old Sarri was unable to take training with the Italian champion on Monday. He has been struggling with the flu for the past week.
The club said he underwent further tests which confirmed he has pneumonia.
Sarri left Chelsea in the offseason to take charge of Juventus. His first Serie A game in charge is at Parma on Saturday.