"Some of it may be, 'I don't want to take the hit because I'm not sure,'" said Green, who is part of the CBS broadcast team for Sunday's Ravens-Raiders game. "I've had back issues and I also did the knee thing like Joe. The knee, you kind of throw a brace on it and you're like, 'I'm going in there and I'm just going to fire it.' Once, you get your strength and range of motion back, you're ready to roll. With the back, it's almost like mentally, 'Is this next little movement or tweak or turn or hit or whatever all of a sudden going to cause it into a spasm?' I'm not saying that's what is occurring with him. I'm just saying that I know mentally, coming back from a back deal is a lot different than coming back from a knee."