With the season opener just a week and a half away, University of Wisconsin Football Coach Bret Bielema has not still decided on a back-up rusher.

He says P.J. Hill is playing well, but there must be a No. 2.

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Sophomore Lance Smith-Williams held that spot last year and he's being challenged by a pair of freshmen - Zach Brown and John Clay.

Bielema says he likes what he sees from both Brown and Clay. Both have shown excellent speed.

However, Clay just arrived at camp after being declared academically eligible and Brown's receiving skills need work.

Bielema has occasionally criticized Smith-Williams for inconsistent play. He's also facing battery and disorderly conduct charges for an alleged fight with his girlfriend last month.

Meanwhile, reserve linebacker and special teams player James Kamoku sat out of practice Tuesday with a calf injury and tight end Andy Crooks missed most of the workout with an undisclosed injury.