Christensen has been with the Colts since 2002 and won a Super Bowl with them as their wide receivers coach in 2006. He spent the past two seasons as the team's offensive coordinator.
The Colts also hired assistant special teams coach Brant Boyer, defensive line coach Gary Emanuel, former Cincinnati Bengals and Baltimore Ravens linebackers coach Jeff Fitzgerald, assistant offensive line coach Joe Gilbert, secondary coach Mike Gillhamer, offensive quality control coach Frank Giufre, tight ends coach Alfredo Roberts, defensive quality control coach Brad White and wide receivers coach Charlie Williams.
"We've assembled a group of coaches full of experience and success at all levels of football, who possess strong character and leadership traits," Colts coach Chuck Pagano said. "I'm excited to embark on the 2012 campaign with a tremendous group of men as we work to achieve our ultimate goal."
The Colts hired Pagano in January after the team's dismal 2011 performance that led to the firing of head coach Jim Caldwell. The team ended the season with a 2-14 record, tied for worst in the NFL.
Manning sat out the entire season due to offseason neck surgery. His contract will give him a $28 million bonus on March 8 — if the Colts decide to pay it. If they don't, Manning will become a free agent.
Indianapolis has the No. 1 overall pick in the 2012 NFL draft and could select Stanford quarterback Andrew Luck.
For more coverage of the NFL, go to profootball.scout.com.
Follow me on Twitter: @RavensInsider
Want more in-depth coverage on your favorite NFL team? Click here and get started today.