"I do feel confident that we have some guys that can do it as we go forward," Harbaugh said Monday. "Obviously, [Tom Zbikowski] will be coming back. Chris Carr's an option back there. Donte' Stallworth will be coming back. [Derrick] Mason has been in my ear to do it. So, guys want to help, guys want to be a part of it, so we'll try to get that thing going."