Coach Joel Quenneville announced Thursday that Sharp (knee) would miss three-to-four weeks. As was expected, Sharp will be looking at essentially a month-long absence after he was forced out of Tuesday's game with the knee injury. The Blackhawks added Peter Regin from AHL Rockford to help restore some depth at forward, but it will be Brandon Saad who is expected to get the first crack at replacing Sharp on the Blackhawks' second line. Sharp has three goals and six assists over 13 games.