Blacknall signed with the Steelers on Friday, Brooke Pryor of ESPN.com reports.
Perhaps Blacknall never left the Steel City, as the Steelers cut the Penn State product exactly one week ago. He still figures to be a long shot to make the roster, but while Diontae Johnson (undisclosed) and Ryan Switzer (foot) tend to injuries, Blacknall will look to prove himself as a worthy depth option.