Ben Roethlisberger: Hopefully I’ll sign an extension “sooner than later”

The Steelers are expected to part ways with a few more veterans from their defense this offseason with safety Troy Polamalu, cornerback Ike Taylor, linebacker James Harrison and defensive end Brett Keisel all possibly at the end of their time with the team. Quarterback Ben Roethlisberger has been teammates with those players for a long…