Wright is expected to be out indefinitely due to a hamstring injury he suffered last week in Dallas, while the Bears are preparing to be without Williams (hamstring) when they face Green Bay.
"It's always an adjustment [potentially being without a starter]," Bears center Olin Kreutz said. "I think Frank can do the job. We believed in him last week, we believe in him this week."
"It's definitely nice to have this week to prepare," Shaffer said. "I mean there are certain looks, certain plays, that on paper, you can go through in your head of what's going to happen. But it's different. I'm not going to get a rep of everything out there as a backup. I get some reps here and there, and I got to prepare mostly on paper.
”In a situation where I knew I was going to play, I would go into it and see it against a defense and against guys. It just makes it so much easier from a preparation standpoint.”
Shaffer is no stranger to being on the field. The nine-year veteran has made 91 career starts during stops in Atlanta, Cleveland and Chicago.
"It's not really nerve racking, I've been in this position before and done it before," Shaffer said. "I'm used to it."
Briggs, who leads the team in tackles (24), has been given the day off the rest his ankle. The linebacker is expected to be back at practice later in the week.