The Steelers used their bye week to rest injured players including Brett Keisel, Willie Parker, Jeff Reed, and Ben Roethlisberger.The team hosted an event to honor wounded veterans of Operation Enduring Freedom and Operation Iraqi Freedom at Heinz Field. Players signed autographs and held on-field drills with the veterans, while soldiers and Marines spoke of their experiences. Chris Hoke, who attended the event said, "These are the people who fight for us to have our freedom and be who we are as Americans. To come out here and spend a couple hours with them and hear their stories is unbelievable. There's nothing better than this."
Question: How many injured players did Steelers rest in the bye week?
Answer: 4