The NFL's irreplaceable players

With the Super Bowl in the books, Football Outsiders starts looking ahead to 2010 and the biggest issues every NFL team will be facing.

February 10: Plugging the Holes - AFC West

• Denver Broncos: What went wrong in the second half?
• Kansas City Chiefs: Can the Chiefs actually run the 3-4?
• Oakland Raiders: Can anyone here play quarterback?
• San Diego Chargers: What's happening at running back?

February 11: Plugging the Holes - NFC West

• Arizona Cardinals: Can Matt Leinart be the team's QB -- and does the team even have a choice?
• St. Louis Rams: How patient should fans be with the rebuilding process?
• San Francisco 49ers : What can stop this team from contending?
• Seattle Seahawks: Do the Seahawks really have three first-round picks in 2010?

February 12: Plugging the Holes - AFC North

• Baltimore Ravens: Is there trouble ahead for the Baltimore defense?
• Cincinnati Bengals: Will the Bengals complete a forward pass in 2010?
• Cleveland Browns: Who is running things here?
• Pittsburgh Steelers: Are the Steelers still the Steelers?

February 15: Plugging the Holes - NFC North

• Chicago Bears: Can Mike Martz save the Bears offense?
• Detroit Lions: Is Matthew Stafford ready to take the next step?
• Green Bay Packers: Is the Green Bay pass defense good enough to get to the Super Bowl?
• Minnesota Vikings: Will the Vikings aging Pro-Bowler retire or return?

February 16: Plugging the Holes - AFC East

• Buffalo Bills: How does this team fit its personnel into a 3-4 defense?
• Miami Dolphins: Can Mike Nolan do for this team what he did for the 2009 Denver Broncos?
• New England Patriots: Can the Pats come to an agreement with Vince Wilfork?
• New York Jets: Will the defense be as good in 2010?

February 17: Plugging the Holes - NFC East

• Dallas Cowboys: Can the team keep up its run of injury luck?
• New York Giants: Can Perry Fewell fix this defense?
• Philadelphia Eagles: Which direction should the team go at QB?
• Washington Redskins: What type of situation did Mike Shanahan walk into here?

February 18: Plugging the Holes - AFC South

• Houston Texans: Can Steve Slaton bounce back?
• Indianapolis Colts: Can the Colts fix their running game?
• Jacksonville Jaguars: What are the Jags doing at quarterback?
• Tennessee Titans: Can Tennessee rebuild their defense?

February 19: Plugging the Holes - NFC South

• Atlanta Falcons: Can Jamaal Anderson step up on defense?
• Carolina Panthers: Is it time to rebuild?
• New Orleans Saints: Does Darren Sharper deserve the franchise tag?
• Tampa Bay Buccaneers: How does this team help Josh Freeman develop?