The AFC West side, who finished last year with the worst record in the league, beat the Green Bay Packers 30-8 in their final pre-season game last night.
Speaking at a press conference, the head coach said: "Do we need to continue to improve? Absolutely. But I was comfortable enough to [take a chance] to look at our depth. I'm pretty comfortable with our first unit and where we're at.
"But in this league you need depth, and I want to make sure I'm picking the right guys there and giving them an opportunity to show what they can do.
"I saw some good things of people I'm looking at. Unfortunately, they were all making good plays. I guess it's fortunate in that you're going to end up with good players. There are some guys that are right in a tight competition."
The Chiefs play the Jacksonville Jaguars in the opening week of the season.