A 2-14 season led to a house cleaning in Indianapolis with the Colts hiring Arians to join new head coach Chuck Pagano. Sources told Schefter the Colts are also planning to hire Keith Butler, Pittsburgh's linebackers coach, as Indy's new defensive coordinator.
Arians, 59, had been the only offensive coordinator in coach Mike Tomlin's five seasons with the Steelers. During his time as coordinator, he turned the Steelers from a run-first team to a pass-heavy one to better suit Roethlisberger.
Though officially retired, team sources had told ESPN senior NFL analyst Chris Mortensen on Jan. 22 that the Steelers let Arians' contract expire against the wishes of quarterback Ben Roethlisberger. The sources said Steelers president Art Rooney II wants the team to regain its blue-collar identity on offense.
Pittsburgh ranked in the top half of the NFL in offense during the past three seasons, but finished a disappointing 12th this past season.
Information from ESPN NFL Insider Adam Schefter and ESPN senior NFL analyst Chris Mortensen was used in this report.