Mitchell hasn't played since sustaining a concussion in week two. He eventually would have gall bladder surgery, too. He's practiced the last two weeks and went through some contact this week with good results.
"He's back and he's OK," Smith said in the Thursday media briefing, the last of the week.
How much could Mitchell play?
"I think he's a thoroughbred and he can run all day," Smith said. "If he's ready to go, he'll start. I'd think he could go 30 or 40 plays. It won't be about the running. It will be more about the actually playing the game and hitting. He's not used to that. He has had contact, as much as we do this time of year. He has shown a willingness to hit."
Hines would be the other (corner). (Kaelon) Kelleybrew is ready to go, too. We'd expect him to play (at corner), too."
Tight end Chris Gragg will not play. Smith said the senior star would be ready for Ole Miss, which follows an off week next weekend.
Running back Ronnie Wingo is still questionable with a shoulder injury, but would dress out Saturday night. Smith said, "He's got a little bit of a shoulder (injury). He'd suit up and we'd see if he's ready to go."
Smith said it was a "good week of practice. Yeah, very, very good week. It was an extremely good Tuesday, better than last Tuesday. And Wednesday was good. Last Wednesday wasn't very good. Today was good, high energy. Now we need to take it to the game field. We've practiced with energy and we need to try to do it again in the game (like at Auburn)."
Smith said the secondary continues to improve in practice. He said knowledge of the scheme at cornerback allowed for tighter coverage and that in turn gave coaches confidence to turn loose more blitzes against Auburn.
"We did walk up the corners more," he said. "We did blitz more because we could take away the quick passing game a little more.
"We'd like to continue to do that this week. The game plan did change from the Texas A&M game. Against A&M, we didn't want to give (Johnny Manziel) a lane because that's how he'll hurt you. We wanted to keep him in the pocket. And that changed (against Auburn), but we did blitz more."