Sills was signed by the Giants on Saturday, Dan Salomone of the Giants' official sitereports.
Sills has spent the majority of the season on the Giants' practice squad, though he has appeared in three games while racking up two receptions for 17 yards. With Kadarius Toney (shoulder), John Ross (knee) and Sterling Shepard (Achilles) all out, Sills figures to serve a depth role among the team's receiving corps Sunday.