INDIANAPOLIS – One horribly bad season has pressed the Colts into major shake-up mode.

Two weeks after cleaning out the front office and two days after firing coach Jim Caldwell, Indianapolis announced most of Caldwell’s assistants are out of work, too.

Among the eight assistant coaches let go Thursday were defensive line coach John Teerlinck and his son, Bill; Frank Reich, the onetime quarterbacks coach who coached the receivers this season; and longtime conditioning coach Jon Torine. Linebackers coach Mike Murphy, who served on the staffs of Jim Mora, Tony Dungy and Caldwell and was promoted to defensive coordinator in late November, decided to retire after 27 seasons on the NFL sideline.

That’s not all.

Defensive backs coach Alvin Williams is leaving the Colts after 10 seasons to become the Minnesota Vikings’ defensive coordinator.

All this came despite the midseason firing of defensive coordinator Larry Coyer and the postseason firing of special teams coordinator Ray Rychleski, Caldwell’s first two hires.

That leaves only nine of 20 coaches who started the season still on the staff. The most notable holdover is offensive coordinator Clyde Christensen.

Team vice chairman Bill Polian and GM Chris Polian were both fired the day after Indianapolis finished a 2-14 season.

Team owner Jim Irsay hasn’t made this many changes since 1997 when he fired the general manager and coach the day after the season ended, then got rid of quarterback Jim Harbaugh so the Colts could take Peyton Manning with the No. 1 pick.

Could it happen again?

If they take Stanford’s Andrew Luck with the No. 1 overall pick, Irsay could elect not to pay Manning a $28 million bonus and let him walk away as a free agent.

New GM Ryan Grigson said earlier this week that he hadn’t yet spoken with Manning and that the medical details would likely dictate Manning’s future. Irsay has said he will pay Manning if he’s healthy enough to play.

The other coaches let go Thursday were assistant Devin Fitzsimmons, offensive line coach Pete Metzelaars, special assistant to the defense Rod Perry, and quarterbacks coach Ron Turner.

The Colts have reportedly sought permission to speak with Tennessee defensive coordinator Jerry Gray, New Orleans offensive coordinator Pete Carmichael and Bengals defensive coordinator Mike Zimmer.

A decision on the new head coach isn’t likely to come until next week.