NASHVILLE, Tenn. -- Tennessee Titans quarterback Steve McNair has said he doesn't know if he'll be able to play Saturday after missing most of practice this week.

He's still questionable for the game Saturday against Oakland.

"I'm still not sure," McNair told ESPN's Andrea Kremer. "They (Titans' medical staff) are doing all they can to get me loose again. I couldn't tell you at this point. I really can't say."

McNair did not throw Friday will arrive at the stadium three hours early Saturday to try and get loose.

"There are concerns," coach Jeff Fisher said. "He hasn't responded like we'd hoped. He's still pretty stiff."

McNair first experienced some stiffness in his lower back late last week. In the first quarter of Sunday's game against Green Bay, he said the muscles tightened up. However, he stayed in the game and led the Titans to a 26-20 victory.

Even McNair is unsure of his status for Saturday night.

"If it's like it is right now, there's no way I can do it," he said. "I'm very surprised. Usually this comes and goes, but this time the spasms have stayed longer than I anticipated."

McNair has been questionable numerous times this season with shoulder, ankle, thumb and elbow injuries. However, he missed just one game, and is now producing the best statistics of his career.