Updated Feb. 14, 2012 @ 3:20 p.m. ET
The Chiefs have finalized Romeo Crennel's coaching staff for the 2012 season, including the retention of QB coach Jim Zorn, who had been passed over for the offensive coordinator job.
On Tuesday, the team announced the final additions to the staff. Nick Sirianni has been promoted to wide receivers coach and Jack Bicknell Jr. was hired as the offensive line coach. Additionally, the team hired Jim Bob Cooter as an offensive assistant and Derius Swinton as a special-teams assistant.
Sirianni had been an offensive quality-control coach the past three seasons for the Chiefs, and Bicknell was the assistant O-line coach for the Giants.
Cooter and Swinton held jobs in similar capacities with the Colts and Rams, respectively, in 2011.
Earlier this month Crennel had hired Brian Daboll, whom he had worked with in New England, as offensive coordinator, choosing him over Zorn and leading to speculation that Zorn wouldn't return in 2012. However, Zorn will be back in the same position he held last season.
In late January, the team hired former Rams special-teams coordinator Tom McMahon as its special-teams coach.
Crennel will serve as his own defensive coordinator, the position he held before he was named to succeed fired head coach Todd Haley.
The coaches who are being retained from the 2011 staff include Maurice Carthon (assistant head coach), Mike Clark (strength & conditioning), Gary Gibbs (linebackers), Bernie Parmalee (tight ends), Anthony Pleasant (defensive line), Brent Salazar (assistant strength & conditioning), Otis Smith (defensive quality control), Emmitt Thomas (defensive backs), Adam Zimmer (defensive assistant/assistant linebackers) and Jim Zorn (quarterbacks).