Iman Shumpert will undergo arthroscopic surgery on his ailing left knee, the Cavaliers announced Thursday. The surgery will take place Friday morning at the Cleveland Clinic, and an official timetable for return will be updated post surgery. However, the Cavs believe Shumpert could miss up to eight weeks, a source said. Shumpert, 27, missed his fifth of the last six games Thursday night because of what the team is calling a left knee effusion.