Injury roundup: CJ2K (hamstring) out 1-2 weeks

Chris Johnson will need to wait to make his debut with the Arizona Cardinals.

The recently signed running back will miss one to two weeks after pulling his hamstring in Thursday's practice, according to coach Bruce Arians, who provided the update after Arizona's 22-19 preseason loss to the San Diego Chargers.

In Johnson's absence, his namesake -- rookie runner David Johnson -- rushed for 66 yards off 13 carries at 5.1 yards per attempt, prompting Arians to say that the first-year runner played well "once he got out of the dance studio."

Arians has repeatedly voiced his concerns over a Cardinals backfield that has yet to produce a clear starter this summer. Last year's featured back, Andre Ellington, is too slight to carry the load alone, leaving the door open for Johnson and Johnson to share the work.

While CJ2K has yet to make an impression on the field, we expect him to make the club after quarterback Carson Palmer called the former 2,000-yard rumbler a "really, really good fit" for the Cards.

Other injuries we're monitoring on this fine Sunday morning:

1. Jordy Nelsonsuffered a knee injury on the Packers' first drive against the Steelers, the team announced. NFL Media Insider Ian Rapoport reports that the initial diagnosis is a torn ACL, according to a source with knowledge of the injury. 

Guard T.J. Lang was evaluated for a concussion, the Packers announced. He was helped off the field in the second quarter and walked into the locker room under his own power. He did not return.

Packers backup quarterback Scott Tolzien was evaluated for a concussion Sunday, according to Mike McCarthy.

2. Steelers center Maurkice Pouncey suffered a broken bone in his left ankle, according to NFL Media's Albert Breer. He left the game early and did not return. He likely will need surgery, Breer reported.

The injuries kept on coming for the Steelers unfortunately. Stephon Tuitt did not return after being carted into the locker room with a left ankle injury in the second quarter, the team announced. Backup quarterback Bruce Gradkowski also left the game early after suffering a finger injury on his left hand.

3. Robert Griffin III participated in team drills on Sunday after leaving Friday's game with a concussion and shoulder stinger, according to the Washington Post. He was cleared for non-contact activity and has no effects of a concussion and will see a neurologist.

4. Johnny Manziel left Browns practice after his throwing arm "started to get a little sore," according to coach Mike Pettine. The second-year passer is unlikely to practice Monday after he was seen pointing at the elbow during 11-on-11s, per Mary Kay Cabot of The Plain Dealer. Manziel experienced similar stiffness before the team's first preseason game, but that didn't keep him from playing. "We're not anticipating it being a long-term thing," Pettine said.

5. Cowboys QB Brandon Weedensuffered a concussion Sunday, team owner Jerry Jones told reporters after the team's loss to the 49ers. Weeden went to the the locker room to be evaluated after he was hit in the head on a sack during the second quarter, the Cowboys' official website reported.

6. Giants linebacker Jon Beason suffered a sprained knee in Saturday's preseason game, coach Tom Coughlin announced, and is listed as "week-to-week."

Coughlin also confirmed that safety Bennett Jackson suffered a season-ending torn ACL.

7. The Chicago Bears are monitoring Marquess Wilson after the receiver went down with a hamstring injury in Saturday's 23-11 preseason win over the Colts. "We don't think it's overly serious but he did not come back," coach John Fox told reporters, per ESPN.com.

8. Jets left tackle Ben Ijalana sprained his MCL, per ESPN. No surgery is anticipated, but a timetable for his recovery has not been set.

9. Falcons wideout Roddy Whitewill have minor right elbow surgery but will be back for the start of the regular season, according to coach Dan Quinn.

10. Niners tight end Vance McDonald sustained an ankle injury against the Cowboys and did not return, the team announced. McDonald, who had a catch before the injury, returned to the sidelines. Niners coach Jim Tomsula said McDonald's injury isn't serious.

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