The Green Bay Packers' ailing passing game will have to step up big time against the Dallas Cowboys on Sunday.

The Packers are extreme

ly thin at running back, with Eddie Lacy as the only rusher on the active roster. Wide receiver Randall Cobb will have to serve as the backup running back, according to NFL Media.

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Lacy is dealing with a sprained ankle that limited his practice time during the week. Practice squad member Don Jackson took several first-team reps with backup James Starks in Buffalo due to a death in his family.

Cobb's career average is seven yards per carry.

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The Packers have rushed for 112 yards per game so far this season, above the league average. The passing game has been much more underwhelming, as they have thrown for just 209.7 yards per game through the first five weeks of the season.