Mallory did not play in the Colts' 34-6 preseason loss to the Falcons on Saturday due to a thumb injury, Joel A. Erickson of The Indianapolis Star reports.
It's unclear when Mallory picked up the injury, as he was a full participant in Thursday's training camp practice. How his thumb responds to treatment over the coming days will determine whether he'll be available for the Colts' preseason finale against the Lions next Saturday. In the Colts' preseason opener against the Patriots, Mallory caught six passes on seven targets for 80 yards.