The 2013 UEFA Best Player in Europe underwent surgery on a trapped nerve in his gluteal muscles and will remain at club doctor Hans-Wilhelm Müller-Wohlfahrt's clinic for the rest of the weekend.
Further tests await
"Franck is suffering from Compartment Syndrome," said Bayern's press spokesman Markus Hörwick at Friday's press conference ahead of the German record champions' trip to 1. FC Nürnberg this weekend. "We will know more after he's undergone further tests on Sunday.
Coach Pep Guardiola hopes the winger will be fit for Bayern's UEFA Champions League last-16 clash with Arsenal on 19 February.