Smith is working back from an ankle injury he suffered in the Jets' first preseason game.
He did not play in their second game due to the injury.
It's kind of the expectation based on the fact that he didn't play in the last game. This is probably Smith's last best chance to make a serious push in his campaign as the team's starting quarterback for the start of the season. With Smith and Sanchez, it's more a matter of when the switch is made then if.