ARLINGTON, Texas -- The Dallas Cowboys aren’t quite ready to let Cooper Rush into the mix to be Dak Prescott's backup.

The undrafted rookie quarterback completed 8 of 9 passes for 92 yards and threw touchdown passes to Noah Brown and Lance Lenoir in the Cowboys’ 24-19 preseason victory against the Indianapolis Colts.

Cooper Rush made the most of his snaps Saturday, completing 8 of 9 passes for 92 yards and two touchdowns in the Cowboys' win over the Colts. AP Photo/Sarah Warnock

Kellen Moore, who remains the Cowboys’ backup to Prescott, completed 10 of 21 passes for 131 yards but saw a sack-fumble turned into an Indianapolis touchdown and directed only one scoring drive -- a field goal -- in six series.

“I’m just glad to see Rush taking advantage of his opportunities out there,” owner and general manager Jerry Jones said. “Wouldn’t want to get ahead of ourselves in any way here. And the other thing is that we ... have a lot of confidence in [Moore], his ability to be able to get in there when we would call on him with the personnel around him and get the ball in the right places. Make no mistake about it, that [with] Rush, it just gets slow when he gets out there, which that’s a compliment. I think Dak’s got it really slowed down.”

In three preseason games, Rush has completed 26 of 38 passes for 283 yards and four touchdowns. After a solid showing in the Hall of Fame Game, Moore has struggled, completing 18 of 38 passes for 200 yards.

“We did move the ball with Kellen,” coach Jason Garrett said. “Missed a couple of those scoring opportunities down in close. We had to settle for field goals. One of them got blocked. But he’s a very smart player, makes good decisions. I though he threw the ball to the right guy a lot. I think the biggest thing if you look at his drives is we got behind the chains a little bit, had some holding penalties, and you’re looking at some tough down and distances. It’s hard to overcome that.”

Rush needed just six plays to direct the Cowboys on a 76-yard drive that ended with a 19-yard touchdown pass to Brown. On his next drive, he converted one third-down chance and hit Lenoir for a 3-yard score.

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“The No. 1 focus: just continue to improve, keep building,” Rush said. “Every week is a new battle, and you’ve just got to keep building on last week’s performance and practicing. Once you’re out there, you’re just playing football. You draw back on all the times you’ve played your whole life, and all those instincts come back. You just go through your reads and play football. All that kind of goes out the window once you step out there.”

Rush spoke Saturday from a spot that was reserved earlier for Prescott and Jaylon Smith. He was surrounded by more cameras and notebooks Saturday than his entire career at Central Michigan.

The attention he got in college was “not on this scale,” he said. “But I’m fine with it.”

He is not even thinking about becoming No. 2 behind Prescott.

“Right now, I just want to be on this roster,” Rush said. “It’s really all I think about: building every day and every game on each other and keep improving.”