During his first and only year with the Texans, Mathieu last year played 16 games, made 70 total tackles, three sacks and two interceptions.
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A third-round pick out of LSU by the Arizona Cardinals in 2013, Mathieu was a first-team All-Pro selection and Pro Bowl participant in 2015. Per Albert Breer of Sports Illustrated, Mathieu was offered a multi-year extension worth more than $9.5 million annually. According to ESPN's Adam Schefter, Mathieu is expected to sign a three-year, $42 million contract.
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With Morse's departure, the Chiefs will likely turn to Austin Reiter as their starting center. He's now started 32 consecutive games and has largely put away any durability concerns.
The people spoke on condition of anonymity Monday because the deal cannot become official until Wednesday, when the new league year begins and free agents can sign contracts.
Mathieu is also still only 26-years-old and should give the Chiefs a prime performer in the secondary. He knew he was in a free-agency class full of talented safeties, which included Landon Collins and Earl Thomas, two players the Chiefs tried to acquire last season before the league's trade deadline.