Sarri, after winning the Europa League with Chelsea last term and finishing third in the Premier League, has returned to Italy at the helm of Juventus, signing a three-year- contract to replace departed Massimiliano Allegri.
The 60-year-old was ordered to rest as he missed the weekend friendly win over Triestina.
A statement by Juventus on Thursday confirming the development read;
“Maurizio Sarri, after having observed rest over the weekend, was at the JTC Continassa today where he coordinated the work of his staff.
“Unfortunately, he could not conduct the training on the field due to the persistence of his flu, which struck him over the course of last week.
“In the late afternoon, he underwent further tests that confirmed he has pneumonia, for which specific therapy has been prescribed.
“The Coach has authorised the club to communicate his state of health.”
Juventus will travel to Parma in their season opener on Saturday and Sarri, whose situation has worsened is unsure to be part of the team.
Having won his first professional trophy as a manager with Chelsea, Sarri will win his first Serie A title with Juventus if the Old Lady defend the accolade after his three-year spell with Napoli failed to clinch Serie A glory.
