NFL training camp roundup: Troy Polamalu looks good and the injury bug continues to plague the league

Charles LeClaire-USA TODAY Sport

Troy Polamalu looked good on Friday, and just about every team in the league has a long injury list at this stage of training camp.

Here's what went down in training camps around the NFL on Friday, a day when every team was on the practice field.

AFC East

Buffalo Bills - Wide receiver Stevie Johnson left practice on Friday with an injured hamstring. Johnson will undergo an MRI to determine the severity of the injury. Either way, it's bad news for the Bills, given that Johnson was their top receiver last year (1,046 yards, six touchdowns) and figured to be again this year.

Miami Dolphins - Wide receivers Mike Wallace and Brian Hartline are dealing with injuries. Both players didn't participate in Friday's practice, which was highlighted by kicker Caleb Sturgis being absolutely on-point.

New England Patriots - On the inury front, Ras-I Dowling, Marcus Cannon, Kevin Haslam, Rob Gronkowski, Jermaine Cunningham and Armond Armstead were all absent. There's not a lot of injury information out there given that Bill Belichick prefers to keep those things quiet. On Friday, Julian Edelman left practice early with an apparent injury.

New York Jets - The Jets didn't exactly have their prettiest practice on Friday. It was their "sloppiest practice of training camp." The defense controlled the goal-line drill, limiting the first-team offense to one score on five plays.

AFC South

Houston Texans - The Texans are a bit thin at the running back position because starter Arian Foster missed Friday's practice and his replacement, Ben Tate, left practice early Friday morning with a groin injury. It doesn't sound like the injury is too serious, however.

Indianapolis Colts - Friday wrapped up a strong week for the tight ends with a solid day. All of the tight ends looked good, which is crucial as the Colts search for some depth behind Coby Fleener. Bjoern Werner also had a good day on Friday. The Colts will take a day off on Saturday.

Jacksonville Jaguars - Quarterback Blaine Gabbert was held out of the majority of practice once again on Friday. Gabbert still looked good for the few plays he was in on, hitting Ace Sanders for a touchdown. Getting him back to practicing in full is a priority, given that he's locked in a starting battle with Chad Henne.

Tennessee Titans - Kenny Britt is feeling healthy, which is a big deal. The Titans need Britt to make it through this season, and Britt needs it to earn a new contract. On Friday, Britt looked great, and caught a big pass over safety Michael Griffin and cornerback Alterraun Verner.

AFC North

Baltimore Ravens - The offense has been the point of focus, as Joe Flacco looks to make even more improvement after his huge new contract. Flacco looked good on Friday, hitting most of his primary receivers on big comeback routes. Torrey Smith, his top target, looked especially good with a great adjustment to make a catch on a pass that was behind him.

Cincinnati Bengals - The wide receivers keep falling at Bengals camp. Pro Bowler A.J. Green and slot receiver Andrew Hawkins both sat out on Friday, but that was expected. Marvin Jones was the surprise inactive as he practiced on the side by himself.

Cleveland Browns - Running back Trent Richardson missed Friday's practice with a bruised right shin. Head coach Rob Chudzinski said it was a precautionary move and that Richardson would have played had there been a game on Friday. Still, it's worrying given Richardson's injury history in such a short amount of time.

Pittsburgh Steelers - Troy Polamalu looks ready to go. On Friday, he stole the show in practice, denying the Steelers' offense in the red zone and batting down multiple passes. Polamalu has been plagued by injury recently and fell from the spotlight in recent years. If training camp has been any indication, though, he'll be just fine.

AFC West

Denver Broncos - Running back Ronnie Hillman had the play of the day on Friday, breaking a 60-yard run during 11-on-11 work. Hillman found his lane and hit the gas, perhaps trying to impress Terrell Davis, who was in attendance.

Kansas City Chiefs - The Chiefs are rolling with new quarterback Alex Smith to lead their offense, and they needed to respond with a solid showing following their poor effort on Thursday. It seems they did that, with Smith looking "particularly sharp." Smith ran the goalline offense effectively.

Oakland Raiders - In addition to signing kicker Sebastian Janikowski to a four-year contract extension, the Raiders looked good in practice on Friday. Running back Rashad Jennings and wide receiver Brice Butler both made big plays on the day and could be making a push for playing time heading into preseason games.

San Diego Chargers - Brandon Taylor returned to practice for the first time since tearing the ACL in his right knee back in December. He's been working hard at getting back, and was removed from the physically unable to perform list to participate in practice.

NFC East

Dallas Cowboys - Wide receiver Terrance Williams left Friday's practice and is being tested for a possible concussion. Williams collided with cornerback Brandon Underwood during a passing drill. If he fails the test, he will be unable to play in Sunday's Hall of Fame Game against the Miami Dolphins.

New York Giants - Offensive lineman Justin Pugh sat out of Friday's practice and is expected to miss a few more days with a concussion. He has to make his way through the NFL's concussion protocol, and although it's not confirmed that he has sustained a concussion, it seems likely.

Philadelphia Eagles - The wide receiver position is the point of focus, with Jeremy Maclin, Arrelious Benn and Riley Cooper all out of action. That gave Ifeanyi Momah and Russell Shepard opportunities to work with the second-team offense and quarterback Nick Foles on Friday. Neither made highlight-reel plays, but they're getting their chances.

Washington Redskins - Robert Griffin III looked fine in practice once again. He'll be the headline throughout all of training camp. He completed six-straight passes at one point, and launched a 50-yard pass through the air to Aldrick Robinson.

NFC South

Atlanta Falcons - Friday was a light day for the Falcons as their "Friday Night Lights" event was held. Head coach Mike Smith held the veterans out of live tackling drills. Desmond Trufant, a first-round pick this year, did get significant playing time, however.

Carolina Panthers - Three players left Friday's practice with seemingly minor injuries. Defensive ends Charles Johnson and Frank Alexander all took to the sidelines with back strains, and wide receiver Domenik Hixon was carted to the locker room with leg cramps.

New Orleans Saints - On Thursday, running back Mark Ingram missed practice, which was a cause for concern for some. But on Friday, Ingram returned to the practice field and suffered no setbacks. Marques Colston sat out again, but head coach Sean Payton said that he could be back soon.

Tampa Bay Buccaneers - Rookie cornerback Johnthan Banks missed practice with a hamstring strain on Friday. Wide receiver Mike Williams, a big contributor, left practice with the same injury. Both appear to be minor, but missed time is significant for both as they are expected to have big roles this season.

NFC North

Chicago Bears - There was a fight at practice on Friday -- tight end Martellus Bennett got into it with multiple players, including Chris Conte, Major Wright and Kelvin Hayden. The scuffle with Hayden turned into a bigger fight, but it sounds like everyone escaped all right.

Detroit Lions - Ron Bartell figures to have a big role with the Lions this year, and he impressed big time on Friday. Bartell recently returned from a shoulder injury on Wednesday and broke up several passes that came his way, including multiple passes intended for Calvin Johnson.

Green Bay Packers - Wide receiver Jordy Nelson sat out practice with a knee injury sustained on Wednesday. Nelson will be one of Aaron Rodgers' top targets this year now that Greg Jennings is no longer with the team. Andrew Quarless is dealing with a quad injury and sat out as well, and Brad Jones injured his finger during the session.

Minnesota Vikings - Backup quarterback Matt Cassel looked good running the two-minute drill. Each quarterback took one series each in the drill, but Cassel had the best showing, securing a couple of first downs. Starter Christian Ponder failed to move the chains at all.

NFC West

Arizona Cardinals - Patrick Peterson played well on Friday, but not much else stood out, aside from the amount of players sidelined by injuries. Daryn Colledge, Rashard Mendenhall, Kory Sperry, Ryan Williams, Alex Okafor, Karlos Dansby, Jeff King, Jamell Fleming, Alex Gottlieb, Dan Williams, Robert Gill, Jay Feely and Darnell Dockett were all absent, with the latter two absent for personal reasons.

Seattle Seahawks - Play was a little sloppy in Friday, thanks to wet conditions on the practice field. The practice amounted to about two full quarters of "fake game" scrimmaging. The backup offense (against the backup defense) beat the No. 1 offense (which went against the No. 1 defense) by a score of 13-10.

San Francisco 49ers - The signing of wide receivers Austin Collie and Lavelle Hawkins made Friday a big day for San Francisco. Both players are necessary given San Francisco's extensive injuries at the receiver position, and both players were on the practice field Friday.

St. Louis Rams - St. Louis' practice was moved indoors due to weather conditions outside. Safety Matt Giordano sat out his second practice and may not be ready for Thursday's preseason opener against the Browns. Tight end Zach Potter and defensive tackle Kendall Langford also sat out of practice with injuries.

More from SB Nation:

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Sebastian Janikowski signs extension with Raiders

Ravens’ Jackson suspended 8 games for PEDs

Complete NFL training camp coverage

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