Jacobs (toe/ankle) wasn't spotted at the start of Friday's practice, Paul Gutierrez of ESPN.com reports.
We'll circle back on Jacobs' status once his official Week 2 injury designation is revealed, but if he's out or limited Sunday against the Steelers, Kenyan Drake would be in line to see added opportunities in the Raiders' backfield, with Peyton Barber (and perhaps Trey Ragas) also in the mix.