NCF Nation: Mark Huyge
Running backs: Iowa's problems with keeping running backs in school has been well documented, and the Hawkeyes lost leading rusher Marcus Coker and backup Mika'il McCall after off-the-field problems last season. The team really needs some more depth in the backfield, and don't be surprised if incoming freshman Greg Garmon pushes for playing time immediately.
Defensive linemen: Iowa had three defensive linemen drafted off the 2010 team and now loses its top two guys up front in departing seniors Broderick Binns and Mike Daniels. That's an awful lot of talent to replace in a couple of years, and the Hawkeyes can't expect to improve their defense without doing so. Finding some more pass rushers off the edge will be key.
Wide receivers: Marvin McNutt had a wonderful senior season, but the passing game often stalled whenever he couldn't wiggle free. Now he's gone, leaving a void at the position. Kevonte Martin-Manley and Keenan Davis have shown promise, but James Vandenberg could use some more weapons. Iowa has secured commitments from three receivers in this class.
Wide receiver: The loss of Darryl Stonum, who was dismissed following another run in with the law, created a void at receiver, especially with top pass-catcher Junior Hemingway out of eligibility. The Wolverines will have to hope Roy Roundtree can bounce back with a big season, because all other wideout options are unproven at this point. Three receivers are committed to Brady Hoke in this class.
Defensive line: Mike Martin and Ryan Van Bergen were key cogs in Michigan's run to the Sugar Bowl title in 2011, and they have both moved on, along with starter Will Heininger. Hoke and defensive coordinator Greg Mattison are defensive line coaches at heart and will want to grab as many difference makers as they can at that key position. Ondre Pipkins, a 325-pound tackle, is the highest rated defensive lineman in the Wolverines' class right now.
Offensive line: While the Wolverines should be fine on the O-line in 2012, even without Rimington Trophy winner David Molk and starting right tackle Mark Huyge, they signed only four offensive linemen total in the past two classes. Since linemen are often slow to develop, they need to refill the cupboard now. Michigan has four offensive linemen committed in this class, including standout Kyle Kalis.
Offensive tackles: Thanks in large part to injuries, Michigan State had to move a defensive lineman (Dan France) to tackle last summer and plug in a junior-college transfer (Fou Fonoti) into the other tackle spot. That the Spartans won the Legends Division title despite that is kind of amazing in retrospect. France will be a junior in 2012 and Fonoti will be in his final year of eligibility. They need more depth at the position, and they've got commitments from two offensive tackles so far in this class.
Wide receivers: Two of the most successful receivers in school history are gone as Keshawn Martin and B.J. Cunningham finished off wildly productive careers. Tennessee transfer DeAnthony Arnett is seeking a waiver to play immediately and will help the future even if he has to sit out a year. Michigan State is looking to sign three other receivers in this class to fill out the future two-deep.
Running back: Edwin Baker's early entry to the NFL draft came as a surprise. Michigan State is still in good shape at tailback for 2012 with Le'Veon Bell and Larry Caper. But after not signing a running back in last year's class, Mark Dantonio could use at least one more option in the backfield.
Defensive backs: It was no secret that Minnesota's pass defense was brutal at times in 2011, and top tackler Kim Royston leaves a hole at safety with his graduation. Getting Troy Stoudermire back for an extra year helps, but Jerry Kill needs to upgrade the talent in the secondary. That's why he has signed three junior-college defensive backs and secured commitments from four high school safeties so far.
Defensive tackle: One of the reasons the pass defense was so bad was a lack of pass rush applied by the front four. The Gophers had only 19 sacks this season, a year after registering just nine. Making matters worse, both starting tackles were seniors this season. Kill signed a junior-college defensive tackle and has two prep tackles committed. He needs to find guys who can find their way to the quarterback.
Overall talent and depth: Kill has said there are gaps in the Gophers' classes, and depth issues could plague the team during his rebuilding efforts. Including six junior-college players signed to help right away, Minnesota has a class of 28 right now. Minnesota simply needs more bodies everywhere.
Linebacker: Lavonte David leaves some rather large cleats to fill. Not only was he Nebraska's leading tackler the past two seasons, he was the only linebacker who played at a consistently high level. The Huskers' starters at the other two linebacker spots will be seniors this year, and depth is thin behind them. So it's little wonder why Bo Pelini has used four spots so far in what is expected to be a small class to fill that position, led by four-star prospect Michael Rose.
Tight end: Three of the top four options at tight ends will be seniors in 2012, leaving very little behind them. Sam Cotton, son of offensive line coach Barney Cotton and younger brother of current Huskers tight end Ben, is on his way to help.
Quarterback: Taylor Martinez is entrenched as the starter going into his junior year, and Nebraska never had to worry about playing Brion Carnes in a big spot this year after Bubba Starling opted for baseball. Still, it's dangerous to not have depth at quarterback, and so the Huskers need to add at least one signal caller in this class.
Defensive backs: The Wildcats were burned repeatedly in the passing game in 2011, and their best defensive back (safety Brian Peters) won't be around next season. Head coach Pat Fitzgerald has commitments from three safeties in this class already.
Defensive playmakers: Northwestern was shockingly short on guys who could blow up another team's offensive play in 2011, so Fitzgerald's main mission had to be finding more guys who played like he did in college. That aim got a big boost when stud defensive end Ifeadi Odenigbo committed to play in Evanston. That's a good start.
Wide receivers: Highly productive star receiver Jeremy Ebert is gone, along with starter Charles Brown. Venric Mark and Christian Jones have a lot of potential as the next big passing targets, but Northwestern's spread offense feeds off of speed and depth at the receiver position. Four receivers have given the Wildcats their pledge in this class.
2. Ohio State: The talent always has been there, and the physical play finally showed up late last fall. Ohio State's line finished 2009 on a very strong note and returns pretty much everyone for 2010. First-team All-Big Ten guard Justin Boren leads the group along with fellow guard Bryant Browning. Center Michael Brewster enters his third season as a starter, and right tackle J.B. Shugarts came along last year. If gifted left tackle Mike Adams effectively protects Terrelle Pryor's blind side, the Buckeyes will be extremely tough to stop.
3. Michigan: The Wolverines boast one of the Big Ten's best interior line tandems in guard Stephen Schilling and center David Molk, who returns from an ACL injury. When Molk was healthy in 2009, Michigan consistently moved the football. His return is a major boost. The Wolverines need to solidify the tackle spots but have experienced options in Perry Dorrestein and Mark Huyge. Michigan's offensive line recruiting also should pay off as redshirt freshmen like Taylor Lewan solidify the depth.
4. Penn State: The line had an average performance in 2009 and struggled against elite defensive fronts, but things should improve this fall. Stefen Wisniewski, who moves back to guard from center, is one of the nation's most experienced and polished offensive linemen. He leads a group that also features veterans Lou Eliades and Johnnie Troutman. Penn State needs big things from new starting left tackle Quinn Barham.
5. Northwestern: All five starters return from 2009, but there's competition at three spots in camp. I see this as a testament to Northwestern's strong O-line recruiting the past four seasons. While experience is great, the Wildcats need to be more physical in run blocking and could benefit from some new faces (or some old ones hardened by competition). Left tackle Al Netter and center Ben Burkett are All-Big Ten candidates, and watch out for Patrick Ward, a heralded 2009 recruit who steps into the spotlight at right tackle this season.
Up next: Running back/fullback
More rankings ...
Posted by ESPN.com's Adam Rittenberg
It's time to go inside five Big Ten teams as they prepare for the start of league play on Saturday.
Illinois -- The defensive line might finally be taking shape for the Illini after some illness/injury issues. Sophomore Josh Brent is back in the fold at defensive tackle, which has allowed standout Will Davis to move back to his natural position of defensive end. Freshman Cory Liuget also has emerged at defensive tackle, a spot vacated when projected starterSirod Williams tore his ACL during training camp. "It's important that we can [rotate] guys in there and keep us fresh," head coach Ron Zook said. Zook called the defensive line the team's strength before the season, but the group will need to elevate its play Saturday night against Penn State's powerful rushing attack, which ranks eighth nationally (274.3 ypg).
Indiana -- When the NCAA cleared Florida transfer Jerimy Finch to play this season, Indiana's secondary looked like one of the deepest groups on the team. That depth will be tested Saturday against Michigan State (ESPN, noon ET). The Hoosiers will be without at least one starting safety (Nick Polk, knee) and could miss their other starter, as strong safety Austin Thomas is questionable for the game with a lower leg injury. Coach Bill Lynch announced that starting cornerback Chris Phillips will miss the remainder of the season with a torn ACL. So the Hoosiers could be replacing three starters against the Spartans. Finch figures to see plenty of time.
Michigan -- A bye week allowed Michigan's offensive line time to heal, though a knee injury to tackle Perry Dorrestein last week in practice clouded things a bit. Mark Ortmann is expected back from a dislocated elbow and should rotate at left tackle with Dorrestein if Dorrestein can play. Left tackle is one of three offensive line spots that have an "OR" listed between potential starters on the depth chart. Converted defensive linemanJohn Ferrara could start at right guard in place of David Moosman, who is listed at both guard and center on the depth chart. Redshirt freshman Mark Huyge also should be back from an ankle injury, so the coaches have some decisions to make up front.
Minnesota -- True freshman running back DeLeon Eskridge has stepped up in the two games after Duane Bennett's knee injury, but coach Tim Brewster isn't quite ready to call Eskridge his featured back. Brewster said Eskridge, freshman Shady Salamon and junior Jay Thomas all will play Saturday at No. 14 Ohio State, and Minnesota will stick with whoever has the hot hand. The coach admitted that identifying a clear-cut starter has become less of a concern than it was after Bennett went down. Eskridge has 192 rushing yards and five touchdowns the last two games.
Ohio State -- Quarterback isn't the only offensive position where youth will be served Saturday against Minnesota. Freshman Michael Brewster remains the starter at center on this week's depth chart after playing a prominent role last week against Troy. The Buckeyes movedJim Cordle from center to left guard after Steve Rehring injured his foot against USC. Rehring will miss "another week or so," coach Jim Tressel said, so that means more time for Brewster, one of several heralded freshmen in Ohio State's recruiting class.