Mack (hamstring) was listed as limited on Monday's estimated injury report.
As he was a week ago, Mack was limited, but the Colts didn't actually hold a formal practice session Monday. His hamstring continues to nag him, and with a short week to prepare for a Thursday night visit to New England, his availability remains up in the air. If he's absent for a fourth time in five games, the Colts will rely on Nyheim Hines and -- to a lesser extent -- Jordan Wilkins to fuel the ground game.