Raiders tight end David Ausberry needs knee surgery, coach Dennis Allen said after Tuesday’s practice, and will miss Friday’s preseason opener against Minnesota. Ausberry was atop the depth chart after a week at training camp.

Allen didn’t disclose the exact nature of the injury or what knee Ausberry hurt. The 2011 7th-round pick had missed the last two practices. Ausberry missed all of the 2013 season after suffering a serious shoulder injury during the Raiders second preseason game.