This is easily the most difficult position to place into a definite organizational chart. There are at least five viable candidates for the two starting spots, and all 10 current roster members have legit chances to make the team.
Chris Houston has started for most of the last four seasons, but a lingering toe injury makes his availability uncertain. As reported by Kyle Meinke of MLive, Houston recently had surgery on the toe, and there is no set timetable for his return.
Rashean Mathis proved invaluable after being signed late in preseason a year ago. He was the Lions' most reliable cover man. He's 34 and didn't find any takers on the free-agent market, however, which doesn't instill a lot of confidence going forward.
Second-year pro Darius Slay is being counted upon to make a big jump. He earned a starting role in camp last year, only to surrender it with terrible play early on. He returned later in his rookie season and played much better.
Two of those three will likely hold down the starting spots.
Former Indianapolis Colts starter Cassius Vaughn could also earn the nod. He's physical for his size and strong in run support. The same can be said of last year's nickelback, Bill Bentley.
If the team opens in a nickel package with three corners, Bentley is the man...for now. Fourth-round pick Nevin Lawson could very well beat him out with a strong preseason, however. In fact, I would judge Lawson's spot on the final 53 to be safer than Bentley's, though there is room for both.
Aaron Hester hasn't received much publicity, but he fits Detroit's profile of a tall corner (6'1") with decent speed. He was on Denver's practice squad last year, and the UCLA product has a real chance to make it in Detroit.
Chris Greenwood finally showed some of the promise expected when the Lions drafted him in 2012, playing quite well in the 2013 finale after coming back from an ill-fated midseason stint in Dallas.
If he can build upon that strong ending, Greenwood could conceivably win a starting spot. Corners his size (6'1", 197 lbs) who can run sub-4.4 40-yard dashes don't exactly grow on trees.
One guy from that same tree is undrafted rookie Mohammed Seisay. He's even bigger and faster than Greenwood, though that didn't help him crack the lineup very often for Nebraska, where he was the fourth corner as a senior. You can watch his impressive workout here on YouTube.
Greenwood's draft classmate, Jonte Green, has demonstrated some competence in intermittent action in his first two years. He has a chance, but the speedy Green is more likely to don a different uniform in 2014.
Final spots: Rashean Mathis, Darius Slay, Cassius Vaughn, Bill Bentley, Nevin Lawson, Chris Greenwood and Aaron Hester, with Chris Houston on PUP to start the year. (7)