Sills suffered an ankle injury in Saturday's exhibition contest against Arizona and has been deemed questionable to return, George Bremer of The Anderson Herald Bulletin reports.
Sills was injured in the first period and isn't certain to return, though Joel A. Erickson of The Indianapolis Star reports that the offensive lineman was up and running on the sideline between quarters. Sills is competing for a spot on the 53-man roster as depth at the offensive guard position.