The team believes it is just a sprain, though he's expected to miss some time while he recovers.
Mike Rodak of ESPN.com added Jones is week-to-week with the injury.
Jones, 22, was a second-round pick (No. 37 overall) by the Bills in this year's NFL draft after a productive four-year stay at East Carolina. He was superb in his senior season, catching 158 passes for 1,746 yards and eight touchdowns.