Given their game against the Reds is two weeks away, Neuer could face a race against time to be fit.
And manager Niko Kovac would not give specifics about his return timetable.
According to German reports he said: "I can not say exactly. When I say it will be five months, there is a big fuss, and if I say it will be five days, everyone thinks it's not that bad.
"The fact is, he was in pain. Otherwise, he would have played."