The Honey Badger is on the move. Per the report, the deal with Kansas City will be worth $42 million over three years after Mathieu played on a one-year prove-it contract in Houston for 2018.
Thomas, who has been seeking a trade or extension from Seattle over the past year, is one of the last marquee free agents safeties available although he's been reported to be seeking the most money.
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He signed a $7 million deal with Houston last season and wound up starting all 16 games.
The Chiefs were aggressive with Mathieu, who they viewed as the best and most complete safety on the free-agent market.
In his lone season with the Texans, Mathieu made 89 tackles, recorded eight passes defensed, sacked the quarterback three times and intercepted two passes.
Many big name players got swooped up early in the tampering part of free agency, with Landon Collins leading the way.