Orlovsky was re-signed late Tuesday, according to a report in the Indianapolis Star. The signal-caller was waived on September 3 after spending the preseason with the team.
The 28-year-old Orlovsky appeared in 13 games for Detroit and Houston in 2008, starting and losing seven of them for the winless Lions in 2008.
The signing signals several key points, the most prominent that the Colts are still searching for answers under center with All-Pro Peyton Manning recovering from offseason neck surgery. It is unclear if Manning will play this season.
Also, Kerry Collins, who started the season's first three games, is under evaluation for a concussion. He left Sunday night's loss to Pittsburgh after three quarters because of concussion-like symptons. Curtis Painter, the only other healthy quarterback on the roster, came into the game and lost a fumble that was returned for a touchdown before engineering a game-tying 80- yard touchdown drive late in the 23-20 loss to the Steelers.
According to the newspaper, the Colts also worked out veteran Brodie Croyle before opting to sign a veteran familiar with the Colts' style and system.
Indianapolis, off to an 0-3 start for the first time since 1998, again takes the national stage next Monday night at Tampa Bay.