The 60-year-old was diagnosed with the illness after missing his side's friendly win over Triestina on Saturday and has been unable to oversee training despite returning to the club's training ground on Monday.
Although Juve said the latest test results have shown an improvement in Sarri's condition, they confirmed he will be absent from the bench as he has been given time to recover.
"Maurizio Sarri underwent further medical tests today, which showed a good clinical improvement," a statement read.
"To completely recover from the pneumonia that hit him over the course of the past few days, the coach will not sit on the bench for the first two Serie A matches against Parma and Napoli.
"The decision was taken to allow the technician, who even today went to the JTC [Juventus Training Centre] to coordinate work with his staff, to resume regular activity as soon as possible."
Juventus head into the new season looking to claim a ninth consecutive Serie A crown as well as capture their first Champions League title in over two decades. The Turin giants appointed Sarri this summer after Massimiliano Allegri brought an end to a successful five-year spell.
After finishing 11 points clear of Napoli last season, Juve have been busy adding to the squad in the close season. Centre-back Matthijs de Ligt was signed from Ajax in a €75 million (£68m/$84m) move, while full-back Danilo joined from Manchester City as part of a deal that saw Joao Cancelo go the other way.
Meanwhile, Aaron Ramsey, Adrien Rabiot and returning club icon Gianluigi Buffon were added in free transfers.