The Facts: Mendenhall is out with knee tendinitis. It’s not serious, HC Bruce Arians said, but Mendenhall needs a couple of days off. He is expected to practice Monday.

Diehards Line:Mendenhall's absence comes as Ryan Williams continues to miss time with a knee problem. He’s questionable for the Green Bay game next week. That leaves three healthy running backs: Alfonso Smith, Stepfan Taylor and Andre Ellington. ... Stay tuned. We'll see if Mendenhall can get back in time for that exhibition opener.