"Shipley went from starting in Week 1 to losing his starting job, to being inactive, to being the third-string center," the report said. "All without any explanation from coach Chuck Pagano or anybody in the front office."
Shipley, 28, has played in 45 career games, starting 19.
Shipley had been listed as doubtful, while Thornton had previously been ruled out.
Running back Trent Richardson (illness) is the only play listed as questionable. While
The Colts are 3 1/2-point favorites.
Youth Indianapolis Colts Andrew Luck Nike Royal Blue Team Color Game Jersey Shop Now!