With the shocking announcement of third-year defensive lineman John Penisini retiring, the Detroit Lions now have a roster spot to fill (actually two considering Jermaine Waller also retired earlier this week). Penisini was considered to be one of the top reserves on the defensive line, so this could slightly alter the landscape of the position. Other than Alim McNeill, he might have been the only other player worthy of filling a nose tackle type role for the defense.
Now that Penisini is gone, there could be a couple of guys that will see this as a great opportunity to make the roster and potentially see some action.