KANSAS CITY, Mo. -- Linebacker Derrick Johnson has signed a five-year contract extension with Kansas City that includes a $15 million guarantee.
Johnson's agent, Jeff Nalley, told The Associated Press the deal was signed Monday.
The deal is potentially worth about $34 million. The Chiefs declined comment.
Johnson was a first-round pick out of Texas in 2005, but his career got off to a slow start and he even lost his starting job last year to Demorrio Williams.
But he got over an ankle sprain and emerged as the starter this year.
Johnson is enjoying his best pro season, recording a team-high 78 tackles and returning an interception for a touchdown as the Chiefs (5-3) grabbed first place in the AFC West.