KC has already added over 30 newcomers to their roster from free agency, the draft and undrafted free agents.
Here are five of those newcomers that will play big roles for Kansas City this season.
Ex-Brown Peyton Hillis was acquired by the Chiefs earlier this offseason to help compliment star RB Jamaal Charles.
With Charles still on the road to recovery from his offseason knee surgery, Hillis is very valuable to this KC offense.
He is very capable of playing a big role for this team, as he is just two years removed from a season where he rushed for nearly 1,200 yards.
I expect big things out of the former seventh-round pick in 2012.
Similar to Peyton Hillis, free-agent tight end Kevin Boss was signed to provide more insurance for injured starter Tony Moeaki and also to add more depth at that position.
The former Giant has started 56 games over the last five seasons and could very well end up being KC's Week 1 starter at tight end if Moeaki is still hurt.
At 6'6", 255 pounds, Boss is a huge target and will give this offense much more flexibility overall.
Providing that he can stay healthy this season, he has a chance to be a big-time weapon for Matt Cassel in the passing game.
There was no bigger free-agent signing made by the Chiefs this year than that of Eric Winston.
The Midland, Texas native was a stalwart along the Texans offensive line over the past six seasons, as he made 87 straight starts during that time.
He grades out very well as both a run blocker and pass blocker and will be a huge upgrade to the right tackle spot along the KC O-line this season.
The only rookie that I have playing a big role for this Chiefs team in 2012 is first round pick Dontari Poe.
Although he has his work cut out for him throughout the rest of the offseason and regular season, he has the measurables and work ethic go overcome it.
Poe's numbers will likely not be very impressive this season, but this is not uncommon for rookie nose tackles who play in the 3-4 defense in this league.
Once he starts to figure some things out, look out for this Kansas City defense.
Newcomer Stanford Routt certainly has big shoes to fill in the Chiefs secondary this season.
He is replacing not only a fan favorite, but also a solid corner-back in Brandon Carr, who is now a member of the Dallas Cowboys, after KC didn't re-sign him earlier this offseason.
Routt will be very important to this team, because he will be need to come in and play well, which will help this secondary to not take a step back this season.
Not to mention, he will be counted on more in coverage considering that KC's two starting safeties are both coming off of surgeries in the last year, in Eric Berry and Kendrick Lewis.