Indianapolis Colts quarterback Andrew Luck may have played in the entire game Sunday against the Tennessee Titans, but he didn't come out of it 100 percent healthy. Apparently Luck suffered a concussion and has since been placed in the NFL's concussion protocol. With a short week prior to Thursday's game against the Pittsburgh Steelers, Indianapolis is planning as if Luck won't be able to go. Instead, the starting duties will now fall on the shoulders of Scott Tolzien. We will keep you updated as more information becomes available.