Marshall Newhouse will play if Sitton does not. McCarthy won't say how that'll work but I'd expect Barclay to move RT to G.Sitton had a bad game against the 49ers, Pro Football Focus gave him a grade of -4.5 for his struggles against DE Justin Smith, and part of the problem might have been a bad back which kept him out of practice on Wednesday. Maybe he hurt it during the game. Unfortunately it's hard to tell at this point whether it's serious.
— Jason Wilde (@jasonjwilde) September 11, 2013
If Sitton does miss their game against the Redskins, Jason Wilde thinks Newhouse would play at right tackle and Don Barclay would move inside. They might even move T.J. Lang back to left guard. During their last preseason game, at times the Packers played the now released T Kevin Hughes at left tackle with Newhouse at RT and Barclay at RG. I don't recall seeing Barclay play on the left side this preseason, though he did play some at center early in training camp.
I don't think Mike McCarthy likes moving his lineman around, but he probably wants his five best lineman on the field. Since I can't recall Newhouse playing anywhere this preseason except at tackle, that would be where he has to go, and the guards might be shuffled around accordingly.