We are exactly a month from the end of the NFL regular season. Thus we are a month and one day from the start of the first process of the 2013 season: the firing of head coaches.

With five games remaining, both the Kansas City Chiefs and San Diego Chargers have to be considered prime candidates to make a coaching change. The Chiefs are 1-10, and Romeo Crennel has to be in danger even though he is in his first full season as coach. In San Diego, Norv Turner’s team is 4-7. It was a major surprise that the team kept Turner after last season. I don’t see any way he makes it to another season, barring an unlikely playoff berth.

The coach firings might not be the end in both cities. If Crennel is fired, general manager Scott Pioli will likely suffer the same fate. I get the feeling Kansas City owner Clark Hunt wants to keep both Pioli and Crennel, but the fan fury is so great, I doubt he'll be able to. San Diego general manager A.J. Smith may also be on the firing line, but I can see a situation where he is kept and Turner is not.

There is always a chance Oakland owner Mark Davis can lose patience and end the Reggie McKenzie-Dennis Allen tandem after one season (or just get rid of coach Allen). But I believe Davis will stick with the current situation despite a disappointing first year.

With potential change in the air, let’s look at some of the coaching candidates, in alphabetical order, who could be available:

Brian Billick went into broadcasting after he was fired by the Ravens in 2008. AP Photo/Gail Burton

Bruce Arians, interim Indianapolis head coach: I’m intrigued by Arians. The longtime offensive coordinator is doing a fantastic job with Colts coach Chuck Pagano out because of his fight with cancer. This is a unique situation. Teams could hire a coach who may lead a team to the playoffs without any restrictions -- and what an audition Arians is having. He has worked with Ben Roethlisberger in Pittsburgh and Andrew Luck in Indianapolis. I could see the Chargers being interested in pairing him with Philip Rivers. The Chiefs could also be a fit for Arians.

Brian Billick, former Baltimore head coach: Billick is interesting because he is a Super Bowl-winning coach who might be reasonably priced. He has a reputation for being a strong offensive mind and a strong leader. He could fit in both San Diego and Kansas City, and I think he could work with an established general manager.

Bill Cowher, former Pittsburgh head coach: When Cowher decides he wants to come back, he will likely have his pick of jobs. I’m not sure if any of the AFC West jobs would be more attractive to him than others. Still, Cowher has a history in Kansas City and is the dream coach for many Chiefs fans. But he may be way too pricey for the team.

Jack Del Rio, Denver defensive coordinator: Del Rio has done a terrific job in Denver and had lots of head coaching experience in Jacksonville. I have a feeling he may remain Denver’s defensive coordinator, but he could be a reasonably priced option for the Chiefs or Chargers.

Jon Gruden, former Oakland and Tampa Bay head coach: The most frequent question I get from readers is this: Is there a chance Gruden could come back to coach the Raiders? I’ve heard that countless times since Gruden was fired by Tampa Bay after the 2008 season. My answer now is the same as always: Probably not. There have been plenty of opportunities for Gruden to come back to Oakland and it has not happened. Never say never, but I’d be surprised. If there is a fit this offseason in the division, I’d say it would be San Diego. I think Gruden -- some reports say the University of Tennesee wants to hire Gruden -- would love to live in San Diego, and he’d love to work with Rivers. I’m not saying Gruden is a favorite to end up in San Diego, but it wouldn’t shock me.

Chip Kelly, University of Oregon head coach: See Cowher. Kelly will get his pick of jobs and he will cost a ton. I’m not sure he’d fit in the AFC West, although working with Rivers could be intriguing to him.

Mike McCoy, Denver offensive coordinator: He is going to be a hot candidate. I think the preferred destination for McCoy, a former Panthers assistant, is to go to Carolina if the Panthers fire Ron Rivera; he is highly regarded there. I could see him receiving interest from the Chiefs as well. He is young, bright and won’t break the bank.

Oregon's Chip Kelly, left, may be too pricey for the AFC West; Stanford's David Shaw could fit better. AP Photo/Paul Sakuma

Wade Phillips, Houston defensive coordinator: The only reason I put Phillips on this list is if Smith remains in San Diego. Smith admires Phillips from Phillips' days as the Chargers’ defensive coordinator. I think he’d be a candidate if Smith is making the choice.

Andy Reid, Philadelphia head coach: Reid is very likely entering his last month in Philadelphia after a tenure that started in 1999. The word around the league is that he will get instant interest. If Reid doesn’t opt to take time off, I could see San Diego being a fit. He has a home in the area and he’d work well with Rivers. But would the Chargers want to replace Turner with a veteran coach who just flamed out after a long stay with a team?

Rex Ryan, New York Jets head coach: It is no sure thing he will be fired, but there’s a chance. I think he could get some interest in the AFC West. He was a finalist in San Diego when Turner got the job. I think the Chiefs could also be interested. They have the makings of a good 3-4 defense -- Ryan’s specialty. Putting him in a small media market could also save Ryan from himself occasionally.

David Shaw, Stanford University head coach: This is one of my favorites. I can really see Shaw ending up in San Diego. He was born there and may be one of the hot young coaches available. I think he’d be perfect for San Diego whether Smith is there or not. His father, Willie Shaw, was a longtime NFL assistant. David Shaw played for Bill Walsh. He worked for Al Davis. He was an assistant to Jim Harbaugh and he has coached Luck. And he has won as a head coach. If I was hiring a coach next month, I’d seriously investigate this 40-year-old.