Florida coach Will Muschamp says standout cornerback Vernon Hargreaves suffered a bone bruise in practice and is day to day.
Muschamp says tests revealed the extent of the injury to Hargreaves' left knee Thursday night.
Hargreaves appeared to get hurt during a scuffle between receivers and defensive backs. Trainers helped Hargreaves from the field, applied ice to his knee and eventually carted him away.
The injury surely scared coaches, teammates and the several hundred fans who turned out for Florida's first open practice of fall camp.
Hargreaves is considered one of the team's top players. The sophomore from Tampa started 10 games last season, finishing with 38 tackles, 11 pass breakups and three interceptions. He was named to the preseason All-Southeastern Conference first team last month.