Both teams have concerns about the grass surface at Levi's Stadium. The 49ers began resodding the field after a Taylor Swift concert eight days ago. But the field still remains in poor enough condition where the 49ers called off five practices.

The Cowboys aren't likely to risk Tony Romo in this setting, especially with the Dallas offensive line expected to be missing four starters. Dallas also will be minus two of its top three wide receivers with Dez Bryant and Cole Beasley sitting and two of its top three tight ends.

The Cowboys will be back their top three running backs - Joseph Randle, Darren McFadden and Lance Dunbar - but none are expected to play long.

Dallas is not concerning itself with preseason right now. The Cowboys managed only seven points in their opening preseason game against the Chargers last week and aren't likely to score much either here.

San Francisco lost a lot of its defensive talent, but remain respectable on that side of the ball. The 49ers' offense, though, has struggled and has yet to show signs of consistency and getting in sync. Given the field conditions, the 49ers are likely, too, to hold out key skill position players, or at least play them very little.