The team's starting center, Ryan Kelly, has also been ruled out for the regular-season opener after undergoing August foot surgery.
First-year general manager Chris Ballard announced Monday that Kelly remains week-to-week, but said optimistically, per the team's official site: "He's close."
Kelly's short-term timeline is somewhat surprising on the heels of reports that the second-year pivot could miss six-to-eight weeks as a logical candidate for IR Recall.
Getting Kelly -- and Luck -- back sooner than later would steer this Colts ship back into friendly waters after a truly dark end to the summer.
Other injuries we're monitoring on this Labor Day while the rest of America sips cocktails and enjoys their respite from the ominous crush of industry:
- The Denver Broncos announced the pass rusher Shane Ray (wrist) will begin the season in injured reserve. Ray suffered a torn ligament in his wrist in the beginning of training camp.