Due to a setback of injuries, Luck had already been ruled out of playing in any preseason games.
Luck missed organized team activities in May because of injuries to his left calf and ankle. He began training camp last month on a limited basis before experiencing a setback.
Indianapolis Colts coach Frank Reich told reporters on Tuesday that he is likely to identify a starting quarterback for the Sept. 8 regular-season opener against the Los Angeles Chargers by Monday.
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