Saibari suffered a ligament tear in his right ankle after appearing to twist it during the match and has already undergone successful surgery. The Morocco international left the stadium on crutches following the incident
Gnabry was substituted just two minutes after Saibari's departure, with Bayern later confirming the German winger had suffered a muscle injury in his left thigh
Bayern also lost French playmaker Michael Olise to an apparent muscle injury late on in the match.
"Saibari and Gnabry will be missing from FC Bayern for the time being," the club said. "Saibari suffered a tear of the syndesmosis ligament in his right ankle joint and has already undergone successful surgery. Gnabry sustained a muscle injury in the posterior left thigh."