SANTA CLARA – Nose tackle D.J. Jones, who supplied the highlight play during a one-on-one drill earlier in practice, left the field 30 minutes early Thursday due to a shoulder injury.
Jones got piled up on an 11-on-11 play near the goal line. He got up in obvious pain, tossed aside his helmet and appeared to be favoring his left shoulder.
After watching the remainder of that period from the field, Jones went to the locker room.
Coach Kyle Shanahan said Jones' condition was being evaluated.
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On Thursday, Jones rudely greeted center Hroniss Grasu, who was signed this week.
During a one-on-one drill that the 49ers' offensive linemen mostly had the upper hand, Jones leveled Grasu with a bull rush, planting the veteran on his backside.
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49ers' D.J. Jones exits practice field after suffering shoulder injury originally appeared on NBC Sports Bay Area