Robinson, who has a team-high 22 tackles, injured his foot late in the fourth quarter in the 45-41 loss to South Carolina Saturday night.
Robinson will miss "at least a couple games," coach Mark Richt said in a teleconference Sunday.
"I don't think it's a broken foot," Richt said. "The X-rays were negative… there might have been a hairline fracture or something in there."
"It's part of the deal," linebackers coach Kirk Olivadotti said earlier this week regarding injuries. "That's why we put the backups in at practice."
Robinson has led the team in tackles in each of the first two games. He had 14 stops against Boise State and eight tackles and a sack against South Carolina.
Freshman Amarlo Herrera, walk-on senior Jeremy Sulek and junior Mike Gilliard are the only remaining inside linebackers with playing experience.
Other options could include moving outside linebackers Ramik Wilson or Chase Vasser to the position. Jarvis Jones, Richt said, will not move from his current position at outside linebacker.
"To say I've got an answer for that yet, I really don't," coach Mark Richt said. ... "The candidates are pretty much the guys that we've got. We've got Michael Gilliard. We've got Amarlo (Herrera). We're working (Jeremy) Sulek," Richt said.