Juventus coach Maurizio Sarri has been diagnosed with pneumonia, the Serie A champions have confirmed, and his status for the club's league opener is unknown.
The 60-year-old Sarri missed Juve's friendly win over Triestina on Saturday due to "the persistence" of flu, which he developed last week.
He returned to the club's training base on Monday but was unable to oversee preparation work on the pitch due to his illness.
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The club conducted further examinations and Sarri has now begun a course of treatment.
A statement released by the club on Monday read: "Maurizio Sarri, after having observed rest over the weekend, was at the JTC Continassa [Juve's training facility] today where he coordinated the work of his staff.