Steve McNair's status for Sunday's game against the Arizona Cardinals remained uncertain Friday because the Tennessee Titans quarterback was held out of practice with a sore back. It was the first time this season he did not participate in a workout Wednesday, Thursday or Friday. Back pain caused him to sit out Wednesday and he was excused for personal reasons on Thursday. Billy Volek worked the whole week with the first-team offense. "We haven't ruled [McNair] out for the game at this point," said coach Jeff Fisher. "He has been in this situation before. We just felt like an extra day would help. He is much better right now than he was last week."