For teams that could possibly make the move for Johnson financially but happen to already have acquired or drafted their franchise running back, you'll find their names here. Of course, adding Johnson to any backfield would be a benefit, but let's assume teams are wise and understand the shelf life of running backs:
St. Louis Rams
It seems like running back Steven Jackson has been in the league forever, but that's more than likely because the 28-year-old workhorse has more than 1,800 carries in seven seasons.
After watching Sam Bradford last season as a rookie quarterback, the Rams could have something pretty special going on in St. Louis. The team would also have a tough time signing Chris Johnson to a long-term deal with just $600,000 in cap space. For now, the Rams will call Bradford and Jackson their team.
New York Giants
More so than believing that the Giants have 100 percent confidence in Ahmad Bradshaw as their franchise running back, New York has very little cap space to work with ($623,000). But, to make things fair, Bradshaw just signed a four-year deal with the Giants, and he is expected to be a playmaker for that offense.
Although his bothersome groin injury appears to be staying quiet at this point, Michael Turner continues to pose an injury concern. I'm not saying the guy isn't durable or tough, but when you lead the league in carries in two of the past three seasons, the game is going to take a toll on you.
Even so, the Falcons are flooded with talent on offense right now, and their cap space is extremely limited.
Arguably equipped with the best running back in the league, the Vikings should be the farthest thing from interested in Johnson. Adrian Peterson has rushed for nearly 5,800 yards in four seasons, and he is undoubtedly the Vikings' best player.
After making such big moves in the offseason, the Panthers find themselves retaining their star running back and limiting themselves in further spending, both of which can turn out really well or really bad.
DeAngelo Williams was drafted by the Panthers in 2006 to become the team's franchise back. Since becoming the main man in 2008, Williams has held up to his end of the deal, rushing for 2,632 yards in 2008 and 2009. We'll see how Williams performs this year after missing 10 games last season to injury.
Without a doubt, Ray Rice is the man in Baltimore. Since 2009, Rice has racked up more than 3,800 yards from scrimmage, and he has proven his versatility and value. Although the Ravens are thin at running back (even after signing Ricky Williams to a one-year deal), I can't see the team moving things around to acquire Johnson.
Kansas City Chiefs
Being a Longhorns fan and consistent fantasy owner of Jamaal Charles, it doesn't take much to realize just how good this guy really is. After signing his long-term deal last season, Charles is the featured back in Kansas City, and the team's $28 million in cap space will be used elsewhere.
New Orleans Saints
The Saints have prepared themselves well at the running back position. After making a starter out of Pierre Thomas, drafting Mark Ingram (likely the future) last April and signing free agent Darren Sproles this summer to serve as the team's scat back, the Saints are unlikely candidates.
It's hard to count on the Eagles on any kind of player acquisitions after what they've done this summer, but I would assume that Andy Reid is content at the running back position. LeSean McCoy is the team's starter, and Ronnie Brown was signed as a very good backup/insurance policy.
The Eagles also drafted Dion Lewis, an undersized runner out of Pittsburgh who could really surprise some people.
New York Jets
Shonn Greene was drafted in 2009 to be the ground-and-pound style of runner Rex Ryan wants for his Jets team. With a little more than $8 million in cap space, the Jets could make a run at Johnson, but it doesn't appear likely.
Teams don't spend Top-10 draft selections on running backs without having huge plans for them, and the Bills did just that in last year's draft when they took C.J. Spiller ninth overall.
With Fred Jackson getting older, Spiller will likely be handed the keys by 2012, and the Bills would have no desire of landing Johnson.
San Francisco 49ers
After being forced to miss five games last season, Frank Gore enters 2011 with the thoughts of a new contract and a healthy recovery from a fractured hip.
According to reports, Gore is a believer in new coach Jim Harbaugh, he's confident that the Niners' front office will take care of him with a new deal and he's prepared to use the doubtfulness of fans to have a breakout season in 2011.
Maurice Jones-Drew is obviously the man in Jacksonville, but it's tough to count out a Johnson-to-Jacksonville rumor.
For one, Johnson would be returning to his home state of Florida. Secondly, Jacksonville has $28 million in cap space—plenty enough to make the move. And finally, the Jaguars could always use a marketing tool like Johnson to put more fans in the seats.
That being said, I don't think anyone is crazy or stupid enough to bring in a guy like Johnson and possibly disrespect a franchise name like MJD.
Jags are out.
And now we move on to the remaining 14 teams...