The Next Man Up

John Feinstein's 2005 book 'Next Man Up: a Year Behind the Lines in Today's NFL' is a gripping, no-holds-barred account of the highs and lows of the Baltimore Ravens' 2004 season. It's an essential read for anyone remotely interested in American football or, indeed, sport at any level.

While the book may have covered the season of just one team, the title applies to all 32 NFL teams and is a phrase that always rears it's ugly head around July and August: training camp. Between organised Team Activities (OTA's) through to the end of the four-game preseason, NFL players are at risk of every kind of season- limiting injury - from torn ACLs and sprained MCLs to herniated discs and dislocated elbows.

Scheduling changes - including the 2014 NFL draft being pushed back until early May - have seen the offseason shortened in an attempt to eliminate overzealous workouts and mini training camps, and yet teams have already seen vitally important players in key positions fall victim to injuries. This article aims to shed some light on the impact of their loss on their respective teams.

Chris Hairston

You are forgiven for being unfamiliar with Chris Hairston. The fourth-year pro replaces not one but two Buffalo Bills offensive linemen after illness sidelined starter Cordy Glenn, and injury struck Seantrel Henderson - his replacement.
Glenn may not be out for the season, but seeing as coach Doug Marrone is reportedly "not allowed to speak" about his illness, we can assume he'll be out of action for a while.
The significance of this comes in the strength of Buffalo's run game. Glenn was a stud in 2013 (he scored a +23.0 on Pro Football Focus last season) and was the stand-out player on a disappointing line (ranked 22nd and given a -12.5 overall rating by PFF). The Bills have stocked up on offense, but a misfiring run game could pile pressure on EJ Manuel and make shutting down an explosive passing game that much easier for defenses.

Giants' Linebackers

Jon Beason experienced a renaissance of sorts in 2013. He was back to his best against the run, made plays all over the field and emerged into a linchpin defensive leader that the Giants have so desperately needed since Antonio Pierce retired in 2008. His injury problems appeared to be behind him - until he suffered a sesamoid bone fracture in his foot during minicamps.
The good news is that this isn't a recurring injury, he doesn't require surgery, and he is tentatively expected back before the season. However, the unconvincing Mark Herzlich and free agent pick up Jameel McClain will be picking up the slack in his absence. His potency against the run will be missed, but it is his on-field leadership that the Giants will suffer without the most.

Falcons Linebackers

Now we enter the realm of season-ending injuries. Sean Weatherspoon missed most of last season, and it is no surprise the Falcons were porous on defence as a result. Entering a contract year, Weatherspoon would have been expected to post a statistically strong season but instead he finds himself sitting on injured reserve with a ruptured achilles tendon. Fortunately for the Falcons, they have a group of intriguing prospects with a lot of potential. Paul Worrilow (99 tackles in 2013), Joplo Bartu (3.5 sacks in 2013), rookie Prince Shembo and the injury-prone Pat Angerer attempt to replace the Falcons' defensive standout. Rough times ahead for an already struggling unit.

Nigel Bradham

As you can see, it's not been a good offseason for the Buffalo Bills. With starting left tackle Cordy Glenn already missing time through injury, the loss of Kiko Alonso for the year comes as another huge blow. Alonso overcame concerns about his size to become the team's leading tackler (third in the league with 159), and the PFWA defensive rookie of the year. That kind of production can't easily be replicated, and it spells bad news for a unit poor against the run in 2013. Thankfully the Bills brought in linebacker depth in the form of Keith Rivers and Brandon Spikes, but neither man is suited for the free-roaming role Alonso played. High starting reps in training camp suggests that the job is the athletic, playmaking Nigel Bradham's to lose, but he faces competition from Preston Brown and Stephenson Sylvester.

Cowboys Linebackers

Linebackers might want to start taking it easy in these offseason practices, however alien the concept of 'taking it easy' may seem to them. The Cowboys' most irreplaceable defensive player had the misfortune of suffering a season-ending ACL injury in first OTA of the year.
Another defence that struggled last season, the impact of Lee's loss will be seen in both on field performance and leadership. The unproven but physically and instinctively gifted Devonte Holloman is the top candidate, but is nursing an injury of his own. Justin Durant, Anthony Hitchens, Dontavis Sapp and Orie Lemon have been filling in during camp, and - in true Cowboys style - the team traded for the troubled and retirement-prone Rolando McClain, and even considered making a play for Brian Urlacher. 

Given that most teams are only just kicking off their training camps, and with four preseason games on top of that, don't be surprised if this list is far longer come the season's opening weekend.