Eason, a sophomore, was hurt on a late hit out of bounds in the first quarter Saturday. Mountaineers defensive tackle Myquon Stout was called for a personal foul.
Eason limped back onto the field and then collapsed behind the line. Fromm quickly began to warm up on the sideline while trainers assisted Eason and then helped him off the field.
More will be known about the severity of Eason's injury on Sunday, Bulldogs coach Kirby Smart said. Smart also said he has the utmost confidence in Fromm.
"There has not been a moment that's been too big for Jake Fromm since he's been a little kid," Smart said. "He's always been that way."
Fromm was 10-of-15 for 143 yards and a touchdown; Eason was 1-for-3 for 4 yards before exiting.
Eason praised his backup, saying Fromm "did exactly what I thought Jake Fromm would do."
Information from The Associated Press was used in this report.