Bill O'Brien is "leaning towards" choosing Texans rookie Tom Savage over newly acquired veteran Thad Lewis as the backup quarterback to Ryan Fitzpatrick for the Sunday game against Tennessee, the Houston Chronicle has reported.

"It's very difficult to ask Thaddeus to come in here and pick up on this offense in three days and be the No. 2 guy Sunday," O'Brien said. "Tom has improved a lot. I think this week has been his best week of throwing the ball. He definitely has a grasp of our offense."

The promotion has Savage smiling, but he's not getting complacent.

"Whether your're two or three, you're always preparing to be the guy at some point," he said. "Nothing really changes for me, just keep working and getting better."