Linebacker Ronald Powell limped off the field at Ben Hill Griffin Stadium in the second quarter of Saturday's Orange and Blue scrimmage game and never returned.
Afterwards, Florida Gators coach Will Muschamp said his understanding was that the injury was just a knee sprain.
Turns out, it was much, much worse.
An MRI revealed Powell has a torn ACL in his left knee and will miss 4-6 months.
"Ronald is in good spirits and is very eager to do whatever is necessary to have a healthy, speedy recovery," Muschamp said Monday. "He has already started with prehab and once the swelling goes down and he regains his range of motion, he will have the surgery."
Powell started 12 games last season, and had 32 tackles and a team-leading six sacks and nine tackles-for-loss.