Blough was examined for a head injury during Sunday's contest at San Francisco.
Blough will start Sunday's game against the 49ers, Tyler Drake of ArizonaSports.com reports.
Blough will start Sunday's game in Atlanta with Colt McCoy bothered by concussion symptoms again, Josh Weinfuss of ESPN.com reports.
The Cardinals signed Blough to their active roster Wednesday.
The Cardinals signed Blough to their practice squad Wednesday, Ian Rapoport of NFL Network reports.
Blough plans to join Minnesota's practice squad, Tom Pelissero of NFL Network reports.
Blough was waived by the Lions on Wednesday.
The Lions are expected to waive Blough if Nate Sudfeld passes his physical in Detroit on Wednesday, Dave Birkett of the Detroit Free Press reports.
Blough completed 17 of 32 passes for 160 yards with one touchdown while rushing twice for 11 yards during Sunday's 19-9 loss to the Steelers.
Coach Dan Campbell indicated Blough will start Detroit's preseason game at Indianapolis on Saturday, Dave Birkett of the Detroit Free Press reports.