Texas Tech coach Tommy Tuberville plans to name a starting quarterback shortly after the team’s second preseason scrimmage, which is scheduled for Aug. 21. Tuberville said he wants whoever emerges to be able to clear his head, know he’s the guy and have a week to a week and a half to work with the first-team offense.

On Wednesday, though, Tuberville said it’s too early to tell any separation between Taylor Potts and Steven Sheffield. He said they’ve both had their moments.

“The one thing I’m looking at is leadership and not turning the ball over — know when to pull the ball down and run, not just throw it up for grabs,’’ Tuberville said.

In that regard, Potts was knocked last season for mechanical lapses, but Sheffield threw interceptions that were returned for touchdowns in the New Mexico, Kansas State and Oklahoma State games.

“As I told them, just throwing a completion is not going to get them on the field,’’ Tuberville said. “Running the offense and keeping control of the ball and moving it down the field is what makes plays.’’

Tuberville said both throw a good deep ball, and offensive coordinator Neal Brown will make use of that.

“But it’s all those things in between the deep ball — getting the running game going, being the leader in the huddle, or the so-called huddle, on the sideline,’’ Tuberville said. “All those things are going to make a difference.’’