University of South Florida junior running back Jamar Taylor suffered a knee injury during Saturday's scrimmage.
"We don't know how bad, we'll have to wait and see," USF coach Jim Leavitt said.
Taylor, who was expected to battle for the starting spot, was coming off a shoulder injury last season.
Without Taylor, the Bulls' running back depth consists of Moise Plancher, Mike Ford, Aston Samuels and Lindsey Lamar.
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