"He was a guy who had really come on and was ready to play," Richt said. "More than likely, we're going to have to have some young guys get reps."
Freshman safety Makiri Pugh also went down with an injury Saturday, suffering a sprained ankle that Richt said will keep him out at least a week.
Redshirt freshman John Knox will move up to third on the depth chart following Banks' injury, while Richt said any number of younger players could jump up to grab the fourth spot, including Baccari Rambo, Nick Williams and senior Andrew Williams.
The injuries may also affect possible redshirt decisions for Richt, who said currently there are no prime candidates on defense to sit out the season.
"There could be a redshirt in the works for one of those guys," Richt said, "but right now we're saying there's not a one of those guys that we're saying he's probably not going to go. We're trying to get them all ready to go."