Updated

A person familiar with the situation says the Kansas City Chiefs have signed defensive end Allen Bailey to a four-year, $25 million contract extension.

Bailey is guaranteed $15 million and will receive a $10 million signing bonus, according to the person, who spoke on condition of anonymity because the Chiefs had not announced the deal.

Pro Football Talk was the first to report the extension.

The 25-year-old Bailey has had a breakout season for the Chiefs, starting all nine games and establishing a career-high four sacks. He's helped the Chiefs deal with season-ending injuries to two starters and still become one of the NFL's best defenses.

Bailey, a former third-round pick, was due to become a free agent after this season.

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