As in Week 1, one of the major injuries of Sunday’s Week 2 games involved a player who never got on the field:

* Indianapolis Colts wide receiver Austin Collie was inactive for the second consecutive week because of a concussion. Collie, who suffered the third concussion of his NFL career during the preseason, was cleared to practice last week, but post-concussion symptoms returned soon afterward. It’s unclear if Collie will be able to play next Sunday.

* On the field, New York Jets running back Shonn Greene suffered the most notable head injury of the day. He went to the locker room after being kicked in the head at the end of a 9-yard run during the first half against the Pittsburgh Steelers. Apparently, Greene passed the concussion test and returned in the third quarter. Expect Greene to be watched closely this week for post-concussion symptoms.

* New England Patriots tight end Aaron Hernandez suffered what appeared to be a serious ankle injury. It was bad enough that he didn’t return for the Arizona Cardinals’ upset victory, and the Patriots wouldn’t disclose how much time Hernandez is expected to miss. The Boston Herald reported Hernandez was seen in the locker room after the game in a walking boot, and source who was briefed on the injury told NFL.com and NFL Network’s Albert Breer that the tight end is believed to have a high ankle sprain.

* In Jacksonville, Jaguars quarterback Blaine Gabbert pulled a hamstring muscle and didn’t return to the game against the Houston Texans. The Jaguars didn’t reveal the extent of Gabbert’s injury.

* St. Louis Rams offensive lineman Rodger Saffold started Sunday, one week after he was carted off the field with a neck injury. However, he suffered a knee injury during the first quarter against the Washington Redskins.

* New York Giants running back Ahmad Bradshaw suffered a neck injury against the Tampa Bay Buccaneers. An X-ray showed no issues, but Bradshaw was declared out for the game. SI.com reported the Giants’ lead back will undergo a MRI on Monday.

* Bradshaw’s Giants teammate, offensive lineman David Diehl, is breathing easier after only spraining his right knee and avoiding damage to his anterior cruciate ligament, USA Today reported.

– Bill Bradley, contributing editor