Quarterback Steve Young will miss at least a week and possibly more because of his latest concussion, but tests showed no signs of more serious brain trauma.
Young took a frightening hit midway through the San Francisco 49ers' 24-10 victory at Arizona on Monday night and left with his fourth concussion since 1996. He underwent an MRI Tuesday and then met with Dr. Gary Steinberg, the chief neurologist at Stanford Hospital who treated Young when he suffered his last concussion two years ago.
Coach Steve Mariucci said earlier he was hopeful Young could play but that any decision on his status for Sunday's game against Tennessee would be based on the medical evaluation.
As if Arizona didn't have enough problems on offense, the Cardinals will be without big-play receiver Rob Moore for a while.
"He's going to be out for a significant amount of time," Coach Vince Tobin said. "How long I don't know, but certainly he won't play this week."
Moore aggravated a pulled hamstring early in Monday night's 24-10 loss to the 49ers.