The 28-year-old played his entire career in Oakland, accumulating 237 tackles and 10 interceptions in his seven seasons for the silver and black.
Kansas City was just one of the three teams that he was scheduled to meet with last week before finally signing a contract with the Chiefs earlier on Monday.
To many, this came as a surprise as there has been no word on the future of upcoming free agent cornerback Brandon Carr.
Carr has started for KC's secondary in each of the last four seasons and his contract is up next month.
On one hand, Routt's signing would give the Chiefs more depth at the CB position, considering they would have three proven cornerbacks for next season and beyond.
Then, there's always the possibility that he was signed because Carr will not be retained later this offseason.
Sure, Carr was one of the better zone CBs in the AFC last season, but Routt has always excelled in man-to-man press coverage.
Paired with stud cornerback Brandon Flowers and defensive mastermind Romeo Crennel next season, look for Routt to have a big year for this Chiefs defense.
Any way you look at it, signing Routt was a win-win move for this organization.