ALAMEDA -- The Raiders had an open roster spot after waiving linebacker Ray-Ray Armstrong on Tuesday.
They filled it the following day, promoting receiver/return specialist from the practice squad. The Cal alum was added to the practice squad last week, and has now been moved up to help fill a void in the return game.
Kickoff returner Taiwan Jones is dealing with a knee injury, and the Raiders took defensive back T.J. Carrie off punt returns Sunday after he absorbed a big blow against Detroit.
Ross could fill either role. He has experience returning kicks and punts. He has 1,389 yards and a touchdown on kickoff returns and 759 yards and a touchdown in the punt return game.
He was cut by the Lions among final cuts, and was released by Baltimore earlier this month after fumbling issues.
Armstrong was waived on Tuesday and claimed by the 49ers. He reunites with former Raiders defensive coordinator Jason Tarver in Santa Clara. He is the 49ers linebackers coach.
The Raiders replaced Ross on the practice squad with linebacker John Lotulelei.