Mike Reiss ESPN Staff Writer
Keep an eye on: The Patriots' situation at defensive end. Veteran Rob Ninkovich wasn't present at practice, while his projected top backup, Kony Ealy, didn't suit up for the session either. That had the Patriots playing Trey Flowers and Geneo Grissom as their top defensive ends. Rookies Derek Rivers (third round) and Deatrich Wise Jr., (fourth round) are also on the depth chart, but they have a long way to go to close the gap on others who have already been in the system. For all the talk about the Patriots having a loaded roster, defensive end looks like a potential spot where they are thinner than desired.