Ellerbe is battling a knee injury that Richt said is progressing on schedule, but hasn't fully healed.
"He's struggling with the lateral movement right now," Richt said. "I wouldn't say that he's 100 percent out but it's doubtful."
Durham tested his injured ankle during practice Wednesday and said he hoped he might be able to play this week, but Richt said the team isn't counting on his availability.
"We're not planning for either one of them right now," Richt said. "If a guy has a great turnaround, he feels great, you might allow him to be on standby, but we don't think either one of them will be real productive and practice right now."
Richt said he expected both players to be ready against LSU in two weeks.