The 29-year-old Sanders played 15 games as a reserve for Arizona in 2012, notching 19 tackles on defense. He was also a key contributor on special teams. Sanders has made 56 career starts, 50 of which came for New England from 2005-2010. He also had a one-season stint with Atlanta in 2011.
The Steelers have lost their top two reserve safeties in free agency, with Will Allen joining the Cowboys and Ryan Mundy signing with the Giants. Safety depth is especially important for the Steelers with Troy Polamalu missing at least two games in five of the last seven seasons.