Halfway through the preseason schedule, the Green Bay Packers' roster and depth chart is starting to take shape.

Here's a look at who hurt their chances during Saturday’s 21-7 victory at the St. Louis Rams:

1. Derek Sherrod: A week ago, the Packers were raving about the return of the former first-round draft pick, who saw his first extensive playing time since he broke his leg late in his rookie season of 2011. A week later, they have reason to be concerned about whether he can be the backup swing tackle they need without Don Barclay (who was lost for the season to knee injury early in camp). Sherrod had all kinds of trouble with a pair of Rams backups. On his very first snap at left tackle, Sherrod got smoked by defensive end Eugene Sims, who drilled quarterback Scott Tolzien just as he released the ball. Later on the same drive, Sims beat Sherrod again to pressure Tolzien into an incompletion. "I thought Scott had some tough situations," coach Mike McCarthy said, referring to the protection problems. Sherrod also got some time at right tackle late in the game, but he did not fare much better. He got beat by rookie Michael Sam, who then sacked Matt Flynn. Although Flynn held the ball for 3.5 seconds (one full second longer than McCarthy wants), the responsibility for the sack should sit with Sherrod.

2. Aaron Adams: See above. Sherrod's running mate at tackle with the No. 2 offensive line had troubles of his own. Playing right tackle on the first series with Tolzien, Adams allowed rookie defensive end Ethan Westbrooks to beat him and then hit Tolzien as he threw. On the next series, Adams gave up a sack to Westbrooks on third down. Adams spent all of last season on the practice squad and had impressed the coaches during the early part of the training camp.

3. Corey Linsley: If the Packers were to lose center JC Tretter during a game, they might be more likely to move one of their starting guards rather than go with rookie Corey Linsley in the middle. Although the fifth-round pick has worked as the No. 2 center throughout camp, his performance against the Rams likely gave the Packers reason to believe he's not ready for regular-season game action. Linsley committed a pair of penalties, including one that wiped out a Tolzien touchdown pass to Myles White. Perhaps it was just a bad day in his first NFL game in a dome because Linsley has been solid in practice.

4. DuJuan Harris: Last season, running back Eddie Lacy fumbled only once – it came in his regular-season debut – in 15 games. If Harris is going to take some of Lacy's snaps this season, he can't cough up the ball like he did in the third quarter. The Packers like Harris as a change-of-pace back but if ball security is an issue, they have other options. Undrafted rookie Rajion Neal was impressive in Week 1 before he sustained a knee injury. He could return this week. Michael Hill averaged 4.3 yards on four carries and had a 27-yard reception against the Rams.

5. Brandon Bostick: The tight end literally hurt himself in the first quarter, when he left the game because of a lower leg injury and did not return. Although Bostick did not start (rookie Richard Rodgers did), he has been making a push for the job and at the very least would be in line for significant playing time. Injuries have slowed Bostick in the past. He finished last season on injured reserve because of a broken foot.