Sources tell Pro Football Weekly that the knee surgery to reconstruct 49ers DE Ray McDonalds medial collateral ligament will keep him out of action through training camp and the first part of the season. Also on the D-line front, we hear 2008 No. 1 pick Kentwan Balmer is expected to rotate at nose tackle with Aubrayo Franklin and Isaac Sopoaga, as well as play left end. Source: Pro Football Weekly
