The Bayern Munich and Germany goalkeeper first suffered an injury in the second leg of Bayern’s Champions League quarter-final defeat to Real Madrid in April before damaging his metatarsal again in September.
He is now only expecting to make a January return.
Speaking to the club’s official website, the 31-year-old said: “The wound has to stay clean and heal by itself.
“Then the healing within the foot takes place. That can even take half a year.”