It seems that Buffon's injury is long, a 2 month period. I am not worried about Zlatan's injury nor Nedved's as both can be replaced, but as you said Buffon is the biggest worry.
May I ask you why do you say Ibrahim instead of Ibrahimovic?
Neddy has a twisted knee, is it something to worry about? NO, we can play without Nedved. Buffon has a strained muscle and probable shoulder dislocation, this is horrible.