Cable said deciding on a starter "may have to be a game-time decision" Sunday in Denver, the Oakland Tribune reported.
"Bruce did some stuff, which was good, and some real easy stuff, in terms of throwing, (but he didn't) cut it loose or throw the ball down the field or anything like that. Moved around fine," Cable said. "Jason is a little bit sore. You saw Kyle practicing. So we'll just continue on that path."
Lechler completed 87 of 101 passes -- 86.1 percent -- for 1,640 yards and 11 touchdowns to lead East Bernard (Texas) High School to the state quarterfinals his senior year.
"There's a set of plays he would run," Cable said. "A what-if thing."
The Associated Press contributed to this report.