Ribery was a key component of the Bayern side which won the Bundesliga, DFB-Pokal (German Cup) and the Champions League last season, following that up with success in the Club World Cup in December to truly rubber-stamp their world domination.
But the winger will now miss at least a week, perhaps more, following surgery on a ‘trapped nerve in his gluteal muscles’ on Thursday evening.
"Franck is suffering from Compartment Syndrome," said Bayern's press spokesman Markus Hörwick.
"We will know more after he's undergone further tests on Sunday.”
Bayern hope to know by Monday whether Ribery, 30, can head straight back into training or if he requires further rest for his buttocks to heal.
In the event of the latter, his participation in the Champions League last-16, first leg tie at the Emirates is very doubtful.
He will certainly miss the league leaders’ trip to Nurnberg on Saturday, the Pokal quarter-final at Hamburg on Wednesday and the home league fixture against Freiburg a week on Saturday.