Pittsburgh showed interest in Galloway during the offseason but chose not to sign him. The Steelers made the move this week after receiver Limas Sweed was put on the reserve/non-football illness list.
Galloway is expected to provide the Steelers depth as the No. 4 receiver behind Santonio Holmes, Hines Ward and rookie Mike Wallace. Ward also has a hamstring injury this week. So it's possible Galloway could become the third receiver if Ward cannot play Sunday against the Baltimore Ravens (8-6).